CN102873003B - Corrosion control method and device for online film formation of pipeline of oil refining and chemical device - Google Patents
Corrosion control method and device for online film formation of pipeline of oil refining and chemical device Download PDFInfo
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- CN102873003B CN102873003B CN201210325777.6A CN201210325777A CN102873003B CN 102873003 B CN102873003 B CN 102873003B CN 201210325777 A CN201210325777 A CN 201210325777A CN 102873003 B CN102873003 B CN 102873003B
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Abstract
The invention relates to a corrosion control method and a device for online film formation of a pipeline of an oil refining and chemical device. The method comprises the following steps of: at the pipeline upstream needing the corrosion control, injecting a film forming matter to the pipeline from a drain valve of the pipeline; and heating the pipeline needing the corrosion control to 200-500 DEG. C, and keeping the temperature for 1-240 hours; and generating a coke film on the inner surface of the pipeline needing the corrosion control. The invention also provides the corrosion control device used in the method, which comprises injecting equipment, a heating casing and heating equipment; the heating casing is provided with a heating medium inlet and a heating medium outlet, and can be spirally wound on the outer surface of a petroleum hydrocarbon device or the pipeline; and the heating device is used for heating the heating medium. The coke film generated by the method is smooth and compact in the flow boundary layer of the inner surface of the pipeline, has stable chemical property, and can isolate the contact between the matters in the pipeline and the inner surface of the pipeline to realize the corrosion control action and ensure the long-period safe operation.
Description
Technical field
The anti-corrosion method and the device that the present invention relates to the online film forming of pipeline of a kind of oil refining and chemical plant installations, belong to oil equipment and pipeline corrosion protection technical field.
Background technology
The anticorrosion technique of the pipeline of oil refining and chemical plant installations is one of current petroleum industry urgent problem, and main anti-corrosion method is to apply anticorrosive at equipment and petroleum pipeline inwall at present, forms erosion shield.
Comparatively complicated with the oil refining of erosion shield and the moulding process of chemical plant installations pipeline, taking petroleum pipeline as example, its moulding process is: the hot-extrudable winding of the impurity cleaning → steel tube surface dust cleaning → steel pipe hot-extrudable winding of heating in medium frequency → epoxy powder electrostatic spraying → primer (being coated) → outer layer polyethylene (being coated) → water cooling moulding → finished product anticorrosive coat divided edge molding → production tube stacking → production tube transports such as the interior steel sand of steel pipe incoming inspection → steel tube surface preheating → Shot Blasting → pipe, anticorrosion cost is higher.And, once destroying appears in this erosion shield, cannot repair, must stop using to change pipeline, this can increase cost significantly, and can affect normally carrying out of production.
Also there are many problems in the erosion shield forming, for example steel tube head coating alice, coating surface present hemispherical or the bulge of semielliptical shape, form inhomogeneous pit, commissure coating attenuate or break and corrosion-inhibiting coating bulge, these all have a strong impact on apparent mass and the anticorrosion ability of protective coating.Especially for hydrocarbon, its component is comparatively complicated, and various corrosive substances are combined, corrosivity is very strong, the high-temperature anticorrosion of oil processing unit is even more important, and applies at present the method for anti-corrosion material formation erosion shield, can not meet the anticorrosion demand of oil refining and chemical plant installations.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide the anti-corrosion method of the online film forming of pipeline of a kind of oil refining and chemical plant installations, be injected into membrane substance in the upstream that needs corrosion-resistant pipeline, by pipeline is carried out to on-line heating, on wall, form anticorrosion rete therein, isolation oil refining contacts with corrosive substance in chemical plant installations and inner surface of pipeline, and pipeline is played to corrosion-resisting function.
The present invention also aims to provide the anti-corrosive apparatus of a kind of oil refining for said method and the online film forming of chemical plant installations pipeline.
For achieving the above object, the invention provides the anti-corrosion method of the online film forming of pipeline of a kind of oil refining and chemical plant installations, it comprises the following steps:
Needing corrosion-resistant pipeline upstream to be injected into membrane substance from the draining valve of pipeline in pipeline, and needs corrosion-resistant pipeline is heated, be heated to 200-500 DEG C and keep 1 hour-240 hours, make to need corrosion-resistant inner surface of pipeline to generate burnt film.
Online anti-corrosion method provided by the present invention is by being injected into membrane substance in the pipeline to oil refining and chemical plant installations, then in the position that needs film forming, pipeline is heated, make its temperature reach the temperature of film forming matter reaction green coke, thereby form the burnt rete that one deck is level and smooth therein, the interior material (being mainly hydrocarbons) of isolating pipelines contacts with inner surface of pipeline, thereby also isolate contacting of the corrosive substance in pipeline and inner surface of pipeline, played etch-proof effect.
In the anti-corrosion method of above-mentioned online film forming provided by the invention, can select different film forming matters according to the character of the material in pipeline, preferably, the film forming matter adopting is diesel oil, reduced crude or its narrow fraction oil, and boiling point is one or more the combination in polycyclic aromatic hydrocarbon compounds of 205-500 DEG C etc.
In above-mentioned online film forming anti-corrosion method provided by the invention, preferably, density, boiling range or the boiling point of the material that the density of film forming matter, boiling range or boiling point are greater than or carry higher than pipeline.
In above-mentioned online film forming anti-corrosion method provided by the invention, according to the different in kind of film forming matter, can select different heating-up temperatures, preferably, the temperature of heating should or be done lower than the boiling point of film forming matter.
In above-mentioned online film forming anti-corrosion method provided by the invention, preferably, the thickness of burnt film is 0.01-10mm (preferably 1.0-5.0mm).
Different with material transporting velocity in pipeline according to the character of film forming matter, the injection rate of film forming matter can be controlled to different degree, be advisable with less speed, but be greater than the speed of film forming matter green coke.The controlling of injecting quantity of film forming matter can ensure the degree of thickness of generated burnt film.Can configure pipe wall thickness measuring apparatus in duct bottom, film forming matter the controlling of injecting quantity increases the degree of 0.01-10mm at required anti-corrosion pipeline bottom wall thickness, until burnt film has generated.
In above-mentioned online film forming anti-corrosion method provided by the invention, preferably, the density of burnt film is 900-1500kg/m
3.
Utilize the chemical composition of burnt film prepared by online film forming anti-corrosion method provided by the invention to be mainly C, two kinds of compositions of H, its stable chemical nature, with contained corrosive substance H in transportation of substances in oil refining and chemical pipeline
2there is not chemical reaction in S, aphthenic acids, chlorion compound etc., can play contacting of corrosive substance in the petroleum hydrocarbon of carrying in isolating pipelines and inner surface of pipeline, plays the antisepsis to pipeline.
Above-mentioned anti-corrosion method provided by the present invention is on-line implement, and can repeat to implement, and does not need the pipeline of inactive oil refining and chemical plant installations, can not affect the carrying out of normal work.
The present invention also provides the anti-corrosive apparatus of a kind of oil refining of the anti-corrosion method for above-mentioned online film forming and the online film forming of pipeline of chemical plant installations, and it comprises injection device, heating muff and firing equipment;
Wherein, described injection device comprises interim joint (for being connected with row of conduits fluid valve), stop valve (for controlling beginning and the termination of implant operation), check valve (for preventing adverse current), measuring pump, film forming matter storage tank (for storing film forming matter);
Described heating muff is provided with heat medium entrance and heat medium outlet, and can be wound in the shape of a spiral the outer surface of described petroleum hydrocarbon device or pipeline;
Described firing equipment is for heating heat medium.
In the anti-corrosive apparatus of above-mentioned online film forming, the injection device, heating muff and the firing equipment that adopt can adopt existing conventional equipment, as long as can realize its function.
In the anti-corrosive apparatus of above-mentioned online film forming, injection device is for being controlled to injection rate and the injection rate of membrane substance, injection rate can decide according to the character of transportation of substances flow velocity and film forming matter in pipeline, and flow velocity is little comparatively suitable, but is greater than the green coke speed of film forming matter.In this injection device, interim joint, stop valve, check valve, measuring pump are connected by pipeline successively with film forming matter storage tank.In the time being injected into membrane substance, first by interim joint, injection device is connected with needs corrosion-resistant pipeline, control injection rate and injection rate by measuring pump.
In the anti-corrosive apparatus of above-mentioned online film forming, preferably, heat medium porch is provided with temperature control equipment, for controlling the temperature of heat medium of heating muff inside.This temperature control equipment is controlled the temperature of the heat medium in heating muff by controlling the flow of heat medium porch, it can adopt any existing equipment that can realize its function.
In the anti-corrosive apparatus of above-mentioned online film forming, preferably, heat medium is water vapour and/or inert gas etc.
In the anti-corrosive apparatus of above-mentioned online film forming, preferably, the cross section of heating jacket is flat, to be wound in better the outside of pipeline.
Generally, the anti-corrosion method of online film forming provided by the present invention and anti-corrosive apparatus are the preservative treatments for horizontal pipe.
The anti-corrosion method tool of the online film forming of pipeline of oil refining provided by the invention and chemical plant installations has the following advantages:
1, the burnt film generating is in the inner surface flow boundary layer of pipeline, and burnt rete is smoothly fine and close, and chemical characteristic is stable, can isolating pipelines internal corrosion material and the contacting of inner surface of pipeline, can play antisepsis to pipeline, and ensure that it can long period safe operation;
2, the anti-corrosion method of this online film forming can carry out in the situation that not stopping work, and does not affect normal production;
3, the film forming matter that the anti-corrosion method of this online film forming adds, compared with the amount that aequum and pipeline are carried, very pettiness, does not affect the character of material in pipeline;
4, the anti-corrosion method of this online film forming is fairly simple, implements easily, and cost is very low;
5, when passing through after the burnt film attenuate of tube wall detect thickness measuring apparatus, the problems such as burnt film appearance is damaged, peel off are described, now needn't stop producing and change pipeline, former burnt film does not need to root out yet, only need re-using method provided by the invention to repeat film forming operation and form new burnt film, both can process quickly and easily problem, not affect again normally carrying out of production.
Brief description of the drawings
The principle schematic of the anti-corrosion method of the online film forming that Fig. 1 provides for embodiment 1;
Fig. 2 is the inner-walls of duct figure that does not generate burnt film in embodiment 1;
Fig. 3 generates burnt film inner-walls of duct figure afterwards in embodiment 1.
Main drawing reference numeral explanation:
Pipeline 1 heat medium entrance 2 heat mediums export the interim joint 6 stop valve 7 check valve 8 measuring pump 9 film forming matter storage tanks 10 of 3 heating muff 4 draining valve 5
Detailed description of the invention
Understand for technical characterictic of the present invention, object and beneficial effect being had more clearly, existing technical scheme of the present invention is carried out to following detailed description, but can not be interpreted as restriction that can practical range of the present invention.
Embodiment 1
The present embodiment provides the anti-corrosive apparatus of the online film forming of pipeline of a kind of oil refining and chemical plant installations, it comprises: injection device, heating muff 4 and firing equipment (not shown), wherein, injection device comprises the interim joint 6 connecting successively, stop valve 7, check valve 8, measuring pump 9 and film forming matter storage tank 10, interim joint 6 is for being connected with the original draining valve 5 of pipeline 1 (being positioned at the bottom of pipeline), for being injected into membrane substance, stop valve 7 is for controlling the carrying out of injection, check valve 8 is for preventing adverse current, measuring pump 9 is for measuring the injection rate of film forming matter of injection, film forming matter storage tank 10 is for storing film forming matter, heating muff 4 is provided with heat medium entrance 2 and heat medium outlet 3, be respectively used to input and heat heat medium afterwards by the heat medium after firing equipment heating and complete twin conduit 1, at heat medium entrance, 2 places are provided with temperature control equipment (not shown), and this temperature control equipment is controlled the temperature of the heat medium in heating muff 4 by controlling the flow of heat medium entrance 2.
The present embodiment also provides the anti-corrosion method of the online film forming of pipeline of a kind of oil refining and chemical plant installations, it is to adopt the anti-corrosive apparatus of above-mentioned online film forming to carry out, as shown in Figure 1, heating muff 4 is wound on the outer surface of pipeline 1 in the shape of a spiral, can strengthen like this contact area of itself and pipeline 1 inner surface, improve heat transfer effect.
The above-mentioned online film forming anti-corrosion method that the present embodiment provides comprises the following steps:
(diameter of pipeline 1 is 300mm to utilize injection device to be injected into membrane substance in the upstream of pipeline 1 by draining valve 6, length is 5m, pipeline internal medium flow velocity is 20m/s, the controlling of injecting quantity of film forming matter is 36kg, injection rate is 1.5kg/h), film forming matter is the narrow fraction oil (boiling range is 350-400 DEG C) of reduced crude, by firing equipment, heat medium is heated to 300 DEG C, then heat medium is introduced heating muff 4 from heat medium entrance 2, carry out exchange heat with pipeline 1 outer surface, continue to carry out 24 hours, the outer surface of pipeline 1 is after heating (its temperature approaches 300 DEG C), in its inner surface boundaries layer, film forming matter reacts and forms burnt film at this temperature.
The situation of pipeline 1 inner surface before heating and after the burnt film of generation respectively as shown in Figures 2 and 3.Wherein, Fig. 2 is the inner surface of pipeline before heating, and it is smoother.Fig. 3 inner surface of pipeline after coking film of making a living, can find out that from figure the inner surface of pipeline has formed a coke charge film significantly, and the thickness of burnt film is 0-5mm, and density is 1050kg/m
3.
Carrying out in antiseptic process, can in the situation that not stopping normal production, carry out, be in pipeline, to carry the starting substance on one side, be injected into membrane substance on one side, show according to research, corrosion mainly occurs in the latter half of pipeline, while being injected into membrane substance, film forming matter mainly covers the bottom (being mainly for horizontal pipe) of pipeline, does not need to cover the whole inwall of pipeline, as long as the part green coke film forming covering just can play good antiseptic effect.
The burnt film that inner surface of pipeline generates has been isolated the hydrocarbon of conveying in pipeline and contacting of inner surface of pipeline, thereby also isolate contacting of ducted corrosive substance and inner surface of pipeline, thereby can play antisepsis to pipeline, ensure that pipeline can long period safe operation.
Claims (13)
1. an anti-corrosion method for the online film forming of pipeline of oil refining and chemical plant installations, it comprises the following steps:
Needing corrosion-resistant pipeline upstream to be injected into membrane substance from the draining valve of pipeline in pipeline, and needs corrosion-resistant pipeline is heated, be heated to 200-500 DEG C and keep 1 hour-240 hours, make to need corrosion-resistant inner surface of pipeline to generate burnt film.
2. method according to claim 1, wherein, described film forming matter is diesel oil, reduced crude or its narrow fraction oil, and boiling point is one or more the combination in the polycyclic aromatic hydrocarbon compounds of 205-500 DEG C.
3. method according to claim 1 and 2, wherein, the density of described film forming matter, boiling range or boiling point are greater than or density, boiling range or the boiling point of the material carried higher than pipeline.
4. method according to claim 1 and 2, wherein, the temperature of described heating is lower than the boiling point of film forming matter or do.
5. method according to claim 3, wherein, the temperature of described heating is lower than the boiling point of film forming matter or do.
6. method according to claim 1 and 2, wherein, the thickness of described burnt film is 0.01-10mm.
7. method according to claim 3, wherein, the thickness of described burnt film is 0.01-10mm.
8. method according to claim 4, wherein, the thickness of described burnt film is 0.01-10mm.
9. method according to claim 5, wherein, the thickness of described burnt film is 0.01-10mm.
10. method according to claim 1, wherein, the density of described burnt film is 900-1500kg/m
3.
11. 1 kinds for the oil refining of anti-corrosion method of the online film forming described in claim 1-10 any one and the anti-corrosive apparatus of the online film forming of pipeline of chemical plant installations, and it comprises injection device, heating muff and firing equipment;
Wherein, described injection device comprises interim joint, stop valve, check valve, measuring pump, film forming matter storage tank;
Described heating muff is provided with heat medium entrance and heat medium outlet, and can be wound in the shape of a spiral the outer surface of petroleum hydrocarbon device or pipeline;
Described firing equipment is for heating heat medium, and wherein, described heat medium is water vapour and/or inert gas.
The anti-corrosive apparatus of 12. online film forming according to claim 11, wherein, described heat medium porch is provided with temperature control equipment, for controlling the temperature of heat medium of described heating muff inside.
13. online film forming anti-corrosive apparatus according to claim 11, wherein, the cross section of described heating muff is flat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210325777.6A CN102873003B (en) | 2012-09-05 | 2012-09-05 | Corrosion control method and device for online film formation of pipeline of oil refining and chemical device |
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| CN201210325777.6A CN102873003B (en) | 2012-09-05 | 2012-09-05 | Corrosion control method and device for online film formation of pipeline of oil refining and chemical device |
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| CN102873003B true CN102873003B (en) | 2014-11-05 |
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| CN104785416B (en) * | 2015-03-14 | 2017-07-21 | 四川迅升油气工程技术有限公司 | The online coating method of high sulfur Gas Fields gathering line and internal pressure vessel walls |
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| JP3160354B2 (en) * | 1992-02-19 | 2001-04-25 | 東京瓦斯株式会社 | Pipe line repair method by suction lining |
| CN1039450C (en) * | 1994-03-18 | 1998-08-05 | 于善杰 | Anti-corrossion metal tube and making method thereof |
| CN1041062C (en) * | 1994-09-13 | 1998-12-09 | 张凤焘 | Process and apparatus for lining of internal surface of metal pipe by dip coating of plastic |
| US5618591A (en) * | 1995-05-15 | 1997-04-08 | Fuse Co. | Method of coating an inside of a pipe or tube |
| CN1122772C (en) * | 2000-12-06 | 2003-10-01 | 张炼 | Process for preparing anticorrosion coating on pipeline |
| CN202823784U (en) * | 2012-09-05 | 2013-03-27 | 中国石油天然气集团公司 | Anticorrosion device of online filming of pipeline of oil refining and chemical engineering device |
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