CN112626528A - Cleaning solution and cleaning method for renewable coke on inner surface of pipeline - Google Patents
Cleaning solution and cleaning method for renewable coke on inner surface of pipeline Download PDFInfo
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- CN112626528A CN112626528A CN202011359659.8A CN202011359659A CN112626528A CN 112626528 A CN112626528 A CN 112626528A CN 202011359659 A CN202011359659 A CN 202011359659A CN 112626528 A CN112626528 A CN 112626528A
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a cleaning solution and a cleaning method for renewable coke on the inner surface of a pipeline. The cleaning liquid which takes sodium hydroxide and potassium permanganate as main components is adopted to ultrasonically clean the interior of the pipeline for 8 hours at the temperature of 80 ℃, coke on the inner surface of the pipeline can be removed, and the pipeline cannot be corroded and damaged in the cleaning process. The cleaning liquid is suitable for cleaning coke formed on the inner wall of the metal pipeline by various endothermic hydrocarbon fuels.
Description
Technical Field
The present invention relates to surface treatment of renewable pipelines, and more particularly to cleaning of coke from the inner surface of metal tubing, such as cooling pipelines, without damaging or damaging the pipeline.
Background
At present, hydrocarbon fuel is widely applied to industrial production and daily life, however, the hydrocarbon fuel inevitably generates carbon deposition in the cracking process and is further heated and coked, so that coke is formed on the wall surface. The coke thus formed reduces the efficiency of the heat exchange on the metal surfaces, reduces the corrosion resistance of the metal material, and blocks valves and filters, even the oil circuit, causing the engine to stall, with serious adverse consequences.
The coke on the inner surface of the renewable pipeline made of the metal material is removed by low-temperature (less than 100 ℃) cleaning, so that the potential safety hazard can be reduced, and the service life of the pipeline can be prolonged. However, cryogenic cleaning of the inner surface of a regenerable pipeline presents several technical challenges:
1) the cleaning of the inner surface of the pipeline is limited by the shape and the size of the inner cavity, the traditional physical cleaning method (such as brushing) is difficult to be applied, and the cleaning quality cannot be ensured.
2) The chemical cleaning agent has strong corrosivity, and can corrode a pipeline while dissolving coke, so that the pipeline cannot meet the use requirement.
3) The coke has stronger inertia at low temperature (less than 100 ℃), is not easy to generate chemical reaction, and causes the difficulty in removing the coke.
Chinese patent CN108150288A discloses a chemical carbon removal method, which adopts the steps of potassium permanganate oxidative decomposition, citrate pre-pickling, cold hydrochloric acid pickling and the like, and is suitable for removing carbon deposition of parts with plating layers of guide pipes with complex shapes and structures. However, for metal pipes, pipes without surface coatings (more in number and more in recycling value) still face the problem of corrosion damage of the pipes caused by chemical cleaning. Meanwhile, the cleaning process takes soaking as a main means, and the problem of incomplete cleaning of the pipeline with a small size exists.
Disclosure of Invention
The invention aims to provide a cleaning solution and a cleaning method for renewable coke on the inner surface of a pipeline, which can effectively remove the coke, can not corrode a metal pipeline, and is suitable for cleaning a coke coating layer which is solidified on a pipeline matrix and is generated by pyrolysis and autoxidation of endothermic hydrocarbon fuel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for cleaning coke on the inner surface of a pipeline comprises the following steps:
1) pre-washing coke formed on the inner wall of a metal pipe (e.g., an alloy steel pipe), and then drying;
2) after the step 1), ultrasonically cleaning the inner surface of the metal pipeline by using a cleaning solution containing sodium hydroxide and potassium permanganate, so that coke is stripped from the inner wall of the metal pipeline and is dispersed in the cleaning solution; the cleaning liquid takes water as a solvent, wherein the weight ratio of sodium hydroxide to potassium permanganate is 1 (1-2).
3) After the step 2), removing cleaning residues (including metal oxides formed by the reaction of the cleaning solution in the cleaning and attached to the inner wall of the pipe and also including the alkaline components of the remaining cleaning solution) on the inner wall of the metal pipe by acid washing and then drying.
Preferably, in the step 1), the pre-cleaning specifically comprises the following steps: respectively carrying out ultrasonic cleaning on the inner surface of the metal pipeline for 10-15 minutes by using acetone, absolute ethyl alcohol and deionized water, wherein the ultrasonic cleaning temperature is 20-30 ℃; in the step 2), the ultrasonic cleaning temperature is 70-80 ℃, and the ultrasonic cleaning time is 8-10 hours.
Preferably, in the step 2), the cleaning solution is composed of, by weight, 85% -90% of mixed alkali solution, 3% -5% of surfactant, 3% -5% of solubilizer and 1% -5% of chelating agent; the mixed alkali solution consists of a sodium hydroxide solution with the mass fraction of 17% -20% and a potassium permanganate solution with the mass fraction of 17% -20%, wherein the weight ratio of the sodium hydroxide solution to the potassium permanganate solution is 1: 1-2.
Preferably, the surfactant consists of a nonionic surfactant (such as fatty alcohol-polyoxyethylene ether) and an anionic surfactant (such as sodium dodecyl benzene sulfonate), and the molar ratio of the nonionic surfactant to the anionic surfactant is 1: 2-3; the solubilizer is selected from isopropanol; the chelating agent consists of sodium tripolyphosphate and triethanolamine, and the weight ratio of the sodium tripolyphosphate to the triethanolamine is 5: 1-2.
Preferably, the step 3) specifically comprises the following steps:
3.1) carrying out ultrasonic cleaning on the inner surface of the metal pipeline subjected to ultrasonic cleaning by the cleaning solution (namely cleaning in the step 2) by using 0.1-0.2 mol/L oxalic acid solution;
3.2) carrying out ultrasonic cleaning on the inner surface of the metal pipeline subjected to the ultrasonic cleaning by the oxalic acid solution (namely the cleaning in the step 3.1) by using a 65-85% ethanol solution, and then drying.
Preferably, in the step 3.1), the ultrasonic cleaning temperature is 70-80 ℃, and the ultrasonic cleaning time is 4-6 hours; in the step 3.2), the ultrasonic cleaning temperature is 20-30 ℃, and the ultrasonic cleaning time is 15-30 minutes.
Preferably, the ultrasonic cleaning in each step is performed by circulating a cleaning reagent (e.g., a cleaning solution) of the corresponding step through a metal pipe under ultrasonic conditions.
A pipeline cleaning liquid comprises sodium hydroxide, potassium permanganate, water and a cleaning aid, wherein the cleaning aid comprises the surfactant, a solubilizer and a chelating agent, and the weight ratio of the sodium hydroxide to the potassium permanganate to the water is 1 (1-2) to 8-10.
Preferably, the cleaning solution consists of 85 to 90 weight percent of mixed alkali solution, 3 to 5 weight percent of surfactant, 3 to 5 weight percent of solubilizer and 1 to 5 weight percent of chelating agent; the mixed alkali solution consists of a sodium hydroxide solution with the mass fraction of 17% -20% and a potassium permanganate solution with the mass fraction of 17% -20%, wherein the weight ratio of the sodium hydroxide solution to the potassium permanganate solution is 1: 1-2.
The surfactant is composed of a nonionic surfactant (such as fatty alcohol-polyoxyethylene ether) and an anionic surfactant (such as sodium dodecyl benzene sulfonate), and the molar ratio of the nonionic surfactant to the anionic surfactant is 1: 2-3; the solubilizer is selected from isopropanol; the chelating agent consists of sodium tripolyphosphate and triethanolamine, and the weight ratio of the sodium tripolyphosphate to the triethanolamine is 5: 1-2.
The application of the pipeline cleaning liquid in cleaning coke formed by cracking and/or autoxidation of endothermic hydrocarbon fuel on the inner wall of a metal pipeline and a pipe fitting.
The invention has the beneficial effects that:
the method utilizes pre-cleaning and solution chemical cleaning (cleaning solution with sodium hydroxide and potassium permanganate as main components) and combines ultrasonic action to remove coke generated by pyrolysis and autoxidation of heat-absorbing hydrocarbon fuel on the inner surface of the metal pipeline under mild conditions (the cleaning temperature is lower, strong-acid cleaning solution is not needed), and ensures that the cleaning solution and the cleaning method can meet the process requirements of practical use (the conditions are mild, the process is simple, and the operation safety is high).
Furthermore, the invention can improve the cleaning effect of main components (sodium hydroxide and potassium permanganate) on coke in the solution chemical cleaning by using the surfactant, the solubilizer and the chelating agent, and solves the problem of corrosion and damage of the pipeline caused by the chemical cleaning. The invention is suitable for cleaning coke formed by various endothermic hydrocarbon fuels on the inner wall of a metal pipeline (especially a pipeline without surface coating).
Drawings
FIG. 1 is a macroscopic view of a cross section of a pipe before a cleaning process.
FIG. 2 is a macroscopic view of the cross section of the pipe after the cleaning process.
FIG. 3 is a typical microscopic morphology and elemental analysis of the inner wall of a pipe prior to a cleaning process; wherein: b) is a) the result of elemental analysis of the location corresponding to the spectral mark 19 in the micro-topography, d) is the result of elemental analysis of the location corresponding to the spectral mark 20 in the micro-topography, c) is the result of elemental analysis of the location corresponding to the spectral mark 21 in the micro-topography, e).
FIG. 4 is a typical microscopic morphology and major element (not less than 2%) analysis of the inner wall of the pipeline after the cleaning process; wherein: b) is a) an elemental analysis result of a position corresponding to the spectrogram marker 7 in the shown micro topography, d) is a result of an elemental analysis of a position corresponding to the spectrogram marker 8 in the shown micro topography, and f) is a result of an elemental analysis of a position corresponding to the spectrogram marker 9 in the shown micro topography.
FIG. 5 is a comparison before and after pre-wash, wherein: a) the micro-topography of the inner surface of the pipeline before pre-cleaning, b) the scanning result of the element C of a), and C) the micro-topography of the inner surface of the pipeline after pre-cleaning.
FIG. 6 is a comparison of the effects of different cleaning agents after cleaning; wherein, a) cleaning cases; b) the control group was washed.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.
Cleaning liquid capable of regenerating coke on inner surface of cooling pipeline
Preparing a cleaning solution according to the weight percentage: 87% of mixed alkali solution, 3% of surfactant, 5% of solubilizer and 5% of chelating agent.
The mixed alkali solution consists of a sodium hydroxide aqueous solution with the mass fraction of 20% and a potassium permanganate aqueous solution with the mass fraction of 20% (the weight ratio of the sodium hydroxide aqueous solution to the potassium permanganate aqueous solution is 1: 1). The surfactant is prepared by compounding fatty alcohol polyvinyl ether and sodium dodecyl benzene sulfonate according to the molar ratio of 1: 2. The solubilizer is isopropanol. The chelating agent is prepared by compounding sodium tripolyphosphate and triethanolamine according to the weight ratio of 5: 1.
When the cleaning solution is prepared, the mixed alkali solution, the surfactant, the solubilizer and the chelating agent are mixed by using magnetons, then the obtained mixed solution is continuously stirred for 10 minutes, and then an ultrasonic cleaning instrument is used for carrying out ultrasonic treatment for 10-15 minutes to uniformly mix the solution.
Cleaning process for coke on inner surface of renewable cooling pipeline
In order to clean coke on the inner surface of the renewable cooling pipeline and ensure that cleaning liquid can fully contact and react with the coke on the inner wall of the pipeline, the cleaning process of the invention utilizes a circulating pump and a heat-preservation container to realize the circulating flow of cleaning reagents such as the cleaning liquid and the like in the pipeline, so that the cleaning process is not limited by the shape and the size of the inner cavity of the pipeline (for example, the cleaning liquid is difficult to reach the center of the slender pipeline only by soaking).
The cleaning process comprises the steps of preparation of cleaning reagents such as cleaning liquid and the like, heating, ultrasonic cleaning and removal of cleaning residues on the inner wall of the pipeline after cleaning, and comprises the following specific steps:
and step one, removing dust attached to the inner wall of the pipeline and organic matters such as alkane and alkene which are not completely decomposed by precleaning.
The specific steps of pre-cleaning are as follows: acetone, absolute ethyl alcohol and deionized water are sequentially used for carrying out ultrasonic cleaning on the inner surface of the pipeline, the whole pipeline is placed in an ultrasonic treatment container (the ultrasonic power is 300-400W), the cleaning time is 10 minutes, and the cleaning temperature is normal temperature (the acetone and the ethyl alcohol are prevented from being volatilized too fast). If the length-diameter ratio of the pipeline is overlarge, acetone, absolute ethyl alcohol and deionized water respectively flow in the pipeline in a circulating mode by using a circulating pump and a heat-insulating container, and the whole pipeline is placed in an ultrasonic treatment container (normal-temperature water is used as an ultrasonic action medium), so that the pre-cleaning efficiency is improved. After cleaning, the pipes were blow-dried using compressed air.
And step two, heating the cleaning solution prepared in the step one, enabling the cleaning solution heated to 80 ℃ to circularly flow in the pre-cleaned pipeline by using a circulating pump and a heat preservation container, cleaning the inner surface of the pipeline by using ultrasonic for 8 hours, putting the whole pipeline in an ultrasonic treatment container (containing water at 80 ℃ as an ultrasonic medium) in the cleaning process, and enabling the ultrasonic power to be 300-400W.
And step three, taking out the pipeline, emptying the liquid in the pipeline, removing the cleaning liquid (at the moment, a certain amount of metal oxide residues are generated after the cleaning liquid is cleaned, so that the inner surface of the pipeline is yellow), using a circulating pump and a heat-preservation container to enable 0.1mol/L oxalic acid solution heated to 80 ℃ to circularly flow in the pipeline, cleaning the inner surface of the pipeline for 4 hours by using ultrasonic waves, integrally placing the pipeline in an ultrasonic treatment container (containing water at 80 ℃ as an ultrasonic medium) in the cleaning process, and enabling the ultrasonic power to be 300-400W.
And step four, taking out the pipeline, emptying the liquid in the pipeline, removing the oxalic acid solution, using a circulating pump and a heat preservation container to enable alcohol (normal temperature) with the volume fraction of 75% to circularly flow in the pipeline, and cleaning the inner surface of the pipeline for 15 minutes by using ultrasonic waves, wherein the whole pipeline is placed in an ultrasonic treatment container (containing normal temperature water as an ultrasonic medium) in the cleaning process, and the ultrasonic power is 300-400W.
And step five, flushing the inner surface of the pipeline by using compressed air until the residual alcohol is dried.
The heat preservation container is formed by coating a container for containing a cleaning solution or an oxalic acid solution by using an LDPE film, and can prevent the change of solution components and the precipitation of partial solute caused by the evaporation of water in the ultrasonic process.
(III) cleaning case and Effect
A316 stainless steel pipe with the inner diameter of 2mm, the outer diameter of 4mm and the length of 1.5m is taken as a cooling pipeline, coke produced by cracking kerosene with the trademark of 851-2 on the inner surface of the cooling pipeline is cleaned as an example, and an ultrasonic cleaning instrument is taken as an ultrasonic treatment container.
A plurality of 2-10 cm long pipe sections are cut before a cleaning experiment. One of the tube sections is cut open, the appearance of the coke on the inner wall of the stainless steel tube is observed (figure 1), and the inner wall of the stainless steel tube is covered by black coke, so that the surface of the stainless steel tube is seriously coked. And (3) after the rest pipe sections are cleaned according to the cleaning process in the step (II), cutting open one pipe section, observing the inner surface appearance (figure 2) of the pipe section, and removing most coke to expose the color of the inner wall of the stainless steel pipeline.
In order to verify the cleaning efficiency of the cleaning process, the micro-morphology and the components of the pipeline before and after the cleaning process are further analyzed. Referring to fig. 3, the composition analysis of several typical regions shows that the carbon content of the rest regions of the inner surface of the pipe is more than 90% except for a part of the regions which are metal carbides, which indicates that the coking of the inner wall of the pipe is serious. Referring to fig. 4, the carbon content in the typical area after the cleaning process is reduced to below 15%, and the content of the tube components such as Fe, Cr, Ni, etc. is increased significantly, which proves that most of the coke is removed and the stainless steel matrix (inner wall of the tube) is fully exposed.
Referring to FIG. 5, coking products of hydrocarbon fuels can be separated into two layers: the surface layer is a colloidal layer which is easier to clean, and what is hard to remove is an asphaltic layer which is positioned below the surface layer and is tightly combined with the matrix. In a whole view, the inner wall of the pipeline is seriously coked before the cleaning process, and the inner wall of the pipeline is covered by coke. After the pre-cleaning is completed, the colloidal layer components in the coke are almost cleaned, but the cleaning effect on the asphaltene layer is very limited, most of the asphaltene layer still adheres to the surface of the stainless steel substrate, and only a few areas of the substrate are exposed. Thus, the use of a precleaning process effectively removes the colloidal layer from the coke, providing an advantage in further cleaning the asphaltene layer (and thus completely stripping the coke coating from the substrate).
(IV) control experiment of cleaning solution formula
Washing the control group: the cleaning solution is different from the cleaning solution, and the rest is the same as the cleaning process in the second step. The cleaning solution of the control group adopts the mixed alkali solution in the step one.
Referring to fig. 6, experiments show that coke in a partial area of the inner wall of the pipeline is not completely removed after the cleaning is performed by using the mixed alkali solution, and a part of area has a channel and a pit (fig. 6b) generated due to corrosion, which indicates that the cleaning effect of the mixed alkali solution is unstable and has a certain corrosion damage to the stainless steel substrate, and proves that the cleaning effect of the cleaning solution (the surface active agent, the solubilizer and the chelating agent are added in the mixed alkali solution) in the step (ii) is better, and the cleaning process does not corrode the stainless steel substrate.
In a word, the invention takes the cleaning of coke on the inner surface of a stainless steel cooling pipeline without a coating on the surface as an example, and provides a cleaning solution and a cleaning method which are suitable for efficiently cleaning coke formed on the inner wall of the pipeline after pyrolysis and autoxidation of heat-absorbing hydrocarbon fuel, thereby providing a simple, convenient, economical and efficient inner surface coke cleaning scheme for a renewable pipeline.
Claims (10)
1. A method for cleaning coke on the inner surface of a pipeline is characterized by comprising the following steps: the method comprises the following steps:
1) pre-cleaning coke formed on the inner wall of the metal pipeline;
2) after the step 1), ultrasonically cleaning the inner surface of the metal pipeline by using a cleaning solution containing sodium hydroxide and potassium permanganate, so that coke is stripped from the inner wall of the metal pipeline and is dispersed in the cleaning solution;
3) after the step 2), removing the cleaning residues on the inner wall of the metal pipeline by acid washing, and then drying.
2. The method for cleaning coke on the inner surface of the pipeline according to claim 1, wherein: the pre-cleaning specifically comprises the following steps: respectively carrying out ultrasonic cleaning on the inner surface of the metal pipeline for 10-15 minutes by using acetone, absolute ethyl alcohol and deionized water, wherein the ultrasonic cleaning temperature is 20-30 ℃; in the step 2), the ultrasonic cleaning temperature is 70-80 ℃, and the ultrasonic cleaning time is 8-10 hours.
3. The method for cleaning coke on the inner surface of the pipeline according to claim 1, wherein: the cleaning solution consists of 85 to 90 weight percent of mixed alkali solution, 3 to 5 weight percent of surfactant, 3 to 5 weight percent of solubilizer and 1 to 5 weight percent of chelating agent; the mixed alkali solution consists of a sodium hydroxide solution with the mass fraction of 17% -20% and a potassium permanganate solution with the mass fraction of 17% -20%, wherein the weight ratio of the sodium hydroxide solution to the potassium permanganate solution is 1: 1-2.
4. The method for cleaning coke on the inner surface of the pipeline according to claim 3, wherein: the surfactant is composed of a nonionic surfactant and an anionic surfactant, and the molar ratio of the nonionic surfactant to the anionic surfactant is 1: 2-3; the solubilizer is selected from isopropanol; the chelating agent consists of sodium tripolyphosphate and triethanolamine, and the weight ratio of the sodium tripolyphosphate to the triethanolamine is 5: 1-2.
5. The method for cleaning coke on the inner surface of the pipeline according to claim 1, wherein: the step 3) specifically comprises the following steps:
3.1) ultrasonically cleaning the inner surface of the metal pipeline cleaned by the cleaning solution by using 0.1-0.2 mol/L oxalic acid solution;
3.2) carrying out ultrasonic cleaning on the inner surface of the metal pipeline subjected to the ultrasonic cleaning by using 65-85% ethanol solution, and then drying.
6. The method for cleaning coke on the inner surface of the pipeline, according to claim 5, is characterized in that: in the step 3.1), the ultrasonic cleaning temperature is 70-80 ℃, and the ultrasonic cleaning time is 4-6 hours; in the step 3.2), the ultrasonic cleaning temperature is 20-30 ℃, and the ultrasonic cleaning time is 15-30 minutes.
7. A pipeline cleaning fluid is characterized in that: the cleaning solution comprises sodium hydroxide and potassium permanganate, wherein the weight ratio of the sodium hydroxide to the potassium permanganate is 1: 1-2.
8. The pipe cleaning liquid as claimed in claim 7, wherein: the cleaning solution consists of 85 to 90 weight percent of mixed alkali solution, 3 to 5 weight percent of surfactant, 3 to 5 weight percent of solubilizer and 1 to 5 weight percent of chelating agent; the mixed alkali solution consists of a sodium hydroxide solution with the mass fraction of 17% -20% and a potassium permanganate solution with the mass fraction of 17% -20%, wherein the weight ratio of the sodium hydroxide solution to the potassium permanganate solution is 1: 1-2.
9. The pipe cleaning liquid as claimed in claim 8, wherein: the surfactant is composed of a nonionic surfactant and an anionic surfactant, and the molar ratio of the nonionic surfactant to the anionic surfactant is 1: 2-3; the solubilizer is selected from isopropanol; the chelating agent consists of sodium tripolyphosphate and triethanolamine, and the weight ratio of the sodium tripolyphosphate to the triethanolamine is 5: 1-2.
10. Use of a pipeline cleaning fluid as claimed in claim 7, 8 or 9 for cleaning the inner wall of metal pipelines, pipe fittings from coke formed by pyrolysis and/or auto-oxidation of endothermic hydrocarbon fuels.
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB865914A (en) * | 1957-05-27 | 1961-04-26 | Turco Products Inc | Composition and process for the cleaning of metal parts |
CN101768749A (en) * | 2008-12-30 | 2010-07-07 | 沈阳黎明航空发动机(集团)有限责任公司 | Chemical carbon removing method of high-pressure turbine blade |
CN103143533A (en) * | 2012-09-03 | 2013-06-12 | 濮阳市德胜实业有限公司 | Cleaning and blockage relieving technology of gathering and transportation system for oil and natural gas field highly containing sulfuric acid |
CN103757650A (en) * | 2013-10-25 | 2014-04-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for ultrasonic removal of carbon deposition |
CN107129878A (en) * | 2017-06-02 | 2017-09-05 | 深圳市裕满实业有限公司 | Automobile combustion chamber carbon deposit cleaning agent and preparation method thereof |
CN108150288A (en) * | 2017-12-18 | 2018-06-12 | 中国航发贵州黎阳航空动力有限公司 | Engine duct carbon removing method |
-
2020
- 2020-11-27 CN CN202011359659.8A patent/CN112626528B/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB865914A (en) * | 1957-05-27 | 1961-04-26 | Turco Products Inc | Composition and process for the cleaning of metal parts |
CN101768749A (en) * | 2008-12-30 | 2010-07-07 | 沈阳黎明航空发动机(集团)有限责任公司 | Chemical carbon removing method of high-pressure turbine blade |
CN103143533A (en) * | 2012-09-03 | 2013-06-12 | 濮阳市德胜实业有限公司 | Cleaning and blockage relieving technology of gathering and transportation system for oil and natural gas field highly containing sulfuric acid |
CN103757650A (en) * | 2013-10-25 | 2014-04-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for ultrasonic removal of carbon deposition |
CN107129878A (en) * | 2017-06-02 | 2017-09-05 | 深圳市裕满实业有限公司 | Automobile combustion chamber carbon deposit cleaning agent and preparation method thereof |
CN108150288A (en) * | 2017-12-18 | 2018-06-12 | 中国航发贵州黎阳航空动力有限公司 | Engine duct carbon removing method |
Non-Patent Citations (1)
Title |
---|
中国炼焦行业协会: "《创新发展中的中国焦化业》", 31 January 2017, 冶金工业出版社 * |
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