CN102873003A - 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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- CN102873003A CN102873003A CN2012103257776A CN201210325777A CN102873003A CN 102873003 A CN102873003 A CN 102873003A CN 2012103257776 A CN2012103257776 A CN 2012103257776A CN 201210325777 A CN201210325777 A CN 201210325777A CN 102873003 A CN102873003 A CN 102873003A
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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 present invention relates to anti-corrosion method and the device of 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 present petroleum industry urgent problem, and main anti-corrosion method is to apply anticorrosive at equipment and petroleum pipeline inwall at present, forms erosion shield.
Moulding process with the oil refining of erosion shield and chemical plant installations pipeline is comparatively complicated, take petroleum pipeline as example, its moulding process is: the impurity cleaning → steel tube surface dust cleaning → steel pipe heating in medium frequency → hot-extrudable winding of epoxy powder electrostatic spraying → primer (coating) → hot-extrudable winding of outer layer polyethylene (coating) → water cooling moulding → finished product anticorrosive coat divided edge molding → production tube stacking → production tube transportations such as the interior steel sand of steel pipe incoming inspection → steel tube surface preheating → Shot Blasting → pipe, anticorrosion cost is higher.And this erosion shield can't be repaired in case appearance destroys, and must stop using to change pipeline, and this can increase cost significantly, and can affect normally carrying out of production.
Also there are many problems in the erosion shield that forms, 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 the 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 that anti-corrosion material forms erosion shield, can not satisfy 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 the corrosion-resistant pipeline, by pipeline is carried out on-line heating, form anticorrosion rete within it on the wall, contacting of corrosive substance in isolation oil refining and the chemical plant installations and inner surface of pipeline played corrosion-resisting function to pipeline.
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 may further comprise the steps:
Be injected into membrane substance at the draining valve that needs corrosion-resistant pipeline upstream from pipeline in pipeline, and needs corrosion-resistant pipeline is heated, be heated to 200-500 ℃ and kept 1 hour-240 hours, making needs the 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 of 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 section forms the level and smooth burnt rete of one deck within it, the interior material (being mainly hydrocarbons) of isolating pipelines contacts with inner surface of pipeline, thereby also isolated contacting of corrosive substance in the 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, character according to the material in the pipeline can be selected different film forming matters, preferably, the film forming matter that adopts is diesel oil, reduced crude or its narrow fraction oil, and boiling point is one or more the combination in 205-500 ℃ the polycyclic aromatic hydrocarbon compounds etc.
In above-mentioned online film forming anti-corrosion method provided by the invention, preferably, the density of film forming matter, boiling range or boiling point are greater than or are higher than density, boiling range or the boiling point of the material that pipeline carries.
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 be lower than the boiling point of film forming matter or do.
In above-mentioned online film forming anti-corrosion method provided by the invention, preferably, the thickness of burnt film is 0.01-10mm (preferred 1.0-5.0mm).
Character according to film forming matter is different with material transporting velocity in the pipeline, the injection rate of film forming matter can be controlled at different degree, is advisable with less speed, but is greater than the speed of film forming matter green coke.The controlling of injecting quantity of film forming matter gets final product in the degree of the thickness of the burnt film that can guarantee to generate.Can configure pipe wall thickness measuring apparatus in duct bottom, the film forming matter the controlling of injecting quantity increases the degree of 0.01-10mm at required anti-corrosion pipeline bottom wall thickness, finish until burnt film generates.
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 the burnt film of online film forming anti-corrosion method preparation provided by the invention to be mainly C, two kinds of compositions of H, its stable chemical nature is with contained corrosive substance H in the transportation of substances in oil refining and the chemical pipeline
2Chemical reaction does not occur in S, aphthenic acids, chlorion compound etc., can play contacting of corrosive substance and inner surface of pipeline in the petroleum hydrocarbon of carrying in the isolating pipelines, 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 operation.
The present invention also provides the anti-corrosive apparatus of the online film forming of pipeline of a kind of oil refining of the anti-corrosion method for above-mentioned online film forming and chemical plant installations, and it comprises injection device, heating muff and firing equipment;
Wherein, described injection device comprises interim joint (being used for being connected with the row of conduits fluid valve), stop valve (being used for beginning and the termination of control implant operation), check valve (being used for preventing adverse current), measuring pump, film forming matter storage tank (being used 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 used for heat medium is heated.
In the anti-corrosive apparatus of above-mentioned online film forming, the injection device that adopts, heating muff and firing equipment 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 used 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 the 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 pipeline with the film forming matter storage tank and connect successively.When being injected into membrane substance, at 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, the heat medium porch is provided with temperature control equipment, is used for the temperature of the heat medium of control heating muff inside.This temperature control equipment is controlled the temperature of the heat medium in the heating muff by the flow of control 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 speaking, 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 of the online film forming of pipeline of oil refining provided by the invention and chemical plant installations has following advantage:
1, the burnt film that generates 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, and can play antisepsis to pipeline, but guarantee its long period safe operation;
2, the anti-corrosion method of this online film forming can in the situation that do not stop work and carry out, not affect normal production;
3, the film forming matter that adds of the anti-corrosion method of this online film forming, aequum is compared with the amount that pipeline is carried, and unusual pettiness does not affect the character of material in the pipeline;
4, the anti-corrosion method of this online film forming is fairly simple, implements easily, and cost is very low;
5, behind the burnt film attenuate by tube wall detect thickness measuring apparatus, the problems such as burnt film appearance is damaged, peel off are described, needn't stop this moment producing changing pipeline, former burnt film does not need to root out yet, only needing to re-use method provided by the invention repeats the film forming operation and forms new burnt film and get final product, both can process quickly and easily problem, not affect again normally carrying out of production.
Description of 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 among the embodiment 1;
Fig. 3 generates burnt film inner-walls of duct figure afterwards among the embodiment 1.
Main drawing reference numeral explanation:
The specific embodiment
Understand for technical characterictic of the present invention, purpose and beneficial effect being had more clearly, existing technical scheme of the present invention is carried out following detailed description, but but can not be interpreted as restriction to practical range of the present invention.
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 that connects successively, stop valve 7, check valve 8, measuring pump 9 and film forming matter storage tank 10, interim joint 6 is used for being connected with pipeline 1 original draining valve 5 (being positioned at the bottom of pipeline), to be used for being injected into membrane substance, stop valve 7 is used for the carrying out that control is injected, check valve 8 is used for preventing adverse current, measuring pump 9 is used for the injection rate of the film forming matter of metering injection, and film forming matter storage tank 10 is used for storing film forming matter; Heating muff 4 is provided with heat medium entrance 2 and heat medium outlet 3, be respectively applied to input by the heat medium after the firing equipment heating and finish pipeline 1 is heated heat medium afterwards, 2 places are provided with the temperature control equipment (not shown) at the heat medium entrance, and this temperature control equipment is controlled the temperature of the heat medium in the heating muff 4 by the flow of control 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 may further comprise the 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, the 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 ℃) of reduced crude, by firing equipment heat medium is heated to 300 ℃, then heat medium is introduced the heating muff 4 from heat medium entrance 2, carry out exchange heat with pipeline 1 outer surface, continued to carry out 24 hours, the outer surface of pipeline 1 is through (its temperature is near 300 ℃) after heating, and film forming matter reacts under this temperature and forms burnt film in its inner surface boundaries layer.
The situation difference of pipeline 1 inner surface before heating and behind the burnt film of generation as shown in Figures 2 and 3.Wherein, Fig. 2 is the front inner surface of pipeline of heating, and it is smoother.Fig. 3 inner surface of pipeline behind the coking film of making a living can find out significantly that from figure the inner surface of pipeline has formed a coke charge film, and the thickness of burnt film is 0-5mm, and density is 1050kg/m
3
In carrying out antiseptic process, can be in the situation that do not stop normally to produce carrying out, be to carry the starting substance in the pipeline on one side, be injected into membrane substance on one side, according to studies show that, corrosion mainly occurs in the latter half of pipeline, when being injected into membrane substance, film forming matter mainly covers the bottom (mainly being for horizontal pipe) of pipeline, does not need to cover the whole inwall of pipeline, as long as the part green coke film forming that covers just can play good antiseptic effect.
The burnt film that inner surface of pipeline generates has been isolated the hydrocarbon of conveying in the pipeline and contacting of inner surface of pipeline, thereby also isolated contacting of ducted corrosive substance and inner surface of pipeline, thereby can play antisepsis to pipeline, but guarantee the safe operation of pipeline long period.
Claims (10)
1. the anti-corrosion method of the online film forming of pipeline of an oil refining and chemical plant installations, it may further comprise the steps:
Be injected into membrane substance at the draining valve that needs corrosion-resistant pipeline upstream from pipeline in pipeline, and needs corrosion-resistant pipeline is heated, be heated to 200-500 ℃ and kept 1 hour-240 hours, making needs the 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 205-500 ℃ the polycyclic aromatic hydrocarbon compounds.
3. method according to claim 1 and 2, wherein, the density of described film forming matter, boiling range or boiling point greater than or be higher than density, boiling range or the boiling point of the material that pipeline carries.
4. each described method according to claim 1-3, wherein, the temperature of described heating is lower than the boiling point of film forming matter or does.
5. each described method according to claim 1-4, wherein, the thickness of described burnt film is 0.01-10mm.
6. method according to claim 1, wherein, the density of described burnt film is 900-1500kg/m
3
7. the anti-corrosive apparatus of the online film forming of pipeline of the oil refining of an anti-corrosion method that is used for each described online film forming of claim 1-6 and chemical plant installations, 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 described petroleum hydrocarbon device or pipeline;
Described firing equipment is used for heat medium is heated.
8. the anti-corrosive apparatus of online film forming according to claim 7, wherein, described heat medium porch is provided with temperature control equipment, is used for controlling the temperature of the heat medium of described heating muff inside.
9. according to claim 7 or 8 described online film forming anti-corrosive apparatus, wherein, described heat medium is water vapour and/or inert gas.
10. online film forming anti-corrosive apparatus according to claim 7, wherein, the cross section of described heating jacket is flat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN102873003A true CN102873003A (en) | 2013-01-16 |
| CN102873003B CN102873003B (en) | 2014-11-05 |
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| CN201210325777.6A Active 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104785416A (en) * | 2015-03-14 | 2015-07-22 | 四川迅升油气工程技术有限公司 | High sulfur gas field gathering pipeline and pressure container inner wall online coating technology |
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| JPH05228439A (en) * | 1992-02-19 | 1993-09-07 | Tokyo Gas Co Ltd | Method for repairing pipeline by suction lining |
| CN1108743A (en) * | 1994-03-18 | 1995-09-20 | 于善杰 | Anti-corrossion metal tube and making method thereof |
| CN1116579A (en) * | 1994-09-13 | 1996-02-14 | 张凤焘 | Process and apparatus for lining of internal surface of metal pipe by dip coating of plastic |
| WO1996037087A1 (en) * | 1995-05-15 | 1996-11-21 | Bernstein Philip Jr | Method of coating an inside of a pipe or tube |
| CN1309015A (en) * | 2000-12-06 | 2001-08-22 | 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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2012
- 2012-09-05 CN CN201210325777.6A patent/CN102873003B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05228439A (en) * | 1992-02-19 | 1993-09-07 | Tokyo Gas Co Ltd | Method for repairing pipeline by suction lining |
| CN1108743A (en) * | 1994-03-18 | 1995-09-20 | 于善杰 | Anti-corrossion metal tube and making method thereof |
| CN1116579A (en) * | 1994-09-13 | 1996-02-14 | 张凤焘 | Process and apparatus for lining of internal surface of metal pipe by dip coating of plastic |
| WO1996037087A1 (en) * | 1995-05-15 | 1996-11-21 | Bernstein Philip Jr | Method of coating an inside of a pipe or tube |
| CN1309015A (en) * | 2000-12-06 | 2001-08-22 | 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104785416A (en) * | 2015-03-14 | 2015-07-22 | 四川迅升油气工程技术有限公司 | High sulfur gas field gathering pipeline and pressure container inner wall online coating technology |
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| CN102873003B (en) | 2014-11-05 |
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