CN115216761A - Method for generating special anti-corrosion protective film under high-temperature and high-pressure dynamic water vapor working condition - Google Patents
Method for generating special anti-corrosion protective film under high-temperature and high-pressure dynamic water vapor working condition Download PDFInfo
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- CN115216761A CN115216761A CN202210928779.8A CN202210928779A CN115216761A CN 115216761 A CN115216761 A CN 115216761A CN 202210928779 A CN202210928779 A CN 202210928779A CN 115216761 A CN115216761 A CN 115216761A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001681 protective effect Effects 0.000 title claims abstract description 17
- 238000005260 corrosion Methods 0.000 title claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 51
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 19
- WKPSFPXMYGFAQW-UHFFFAOYSA-N iron;hydrate Chemical compound O.[Fe] WKPSFPXMYGFAQW-UHFFFAOYSA-N 0.000 claims abstract description 18
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 239000003518 caustics Substances 0.000 claims abstract description 13
- 239000007785 strong electrolyte Substances 0.000 claims abstract description 13
- 238000009826 distribution Methods 0.000 claims abstract description 7
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229910000859 α-Fe Inorganic materials 0.000 claims description 12
- 230000003647 oxidation Effects 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 238000011033 desalting Methods 0.000 claims description 6
- 238000000909 electrodialysis Methods 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 238000005342 ion exchange Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- -1 iron ions Chemical class 0.000 claims description 6
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 6
- 238000001223 reverse osmosis Methods 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 229910001415 sodium ion Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000007747 plating Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 abstract description 2
- 238000006386 neutralization reaction Methods 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract description 2
- 239000003245 coal Substances 0.000 abstract 2
- 239000003814 drug Substances 0.000 abstract 1
- 238000010248 power generation Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000000280 densification Methods 0.000 description 3
- 239000007888 film coating Substances 0.000 description 3
- 238000009501 film coating Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/62—Treatment of iron or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/427—Treatment of water, waste water, or sewage by ion-exchange using mixed beds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- Mechanical Engineering (AREA)
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Abstract
The invention provides a method for generating a special anticorrosive protective film under a high-temperature high-pressure water vapor dynamic working condition, which belongs to the technical field of equipment protection under the high-temperature high-pressure water vapor working condition and comprises the following steps: generating high-temperature and high-pressure water vapor working condition in equipment, adding medicine into the water vapor working condition environment, regulating the environmental distribution index dynamic balance, generating iron oxide or ferroferric oxide coating film on the water vapor working condition environment contact surface, and reacting caustic alkali strong electrolyte with the iron oxide or ferroferric oxide coating film to generate FeOH (Fe) 2 O 3 ·H 2 O) coating film, the film molecule is needle-shaped structure, the degree of compactness is more than Fe 2 O 3 Or Fe 3 O 4 The oxide film is 2 orders of magnitude higher, can prevent the corrosion of high-temperature high-pressure apparatus inner wall or surface effectively, not only can lengthen the apparatus life-span, can prevent scaling, salt deposit, pipe explosion, etc. caused by corrosion, can promote or guarantee the unit efficiency effectively through the initiative prevention of the water treatment means, reduce the coal consumption of unit power generation or ton steam coal consumption, realize the carbon reduction of essence from the industrial source, realize the carbon neutralization of industrial stock indirectly.
Description
Technical Field
The invention belongs to the technical field of protection of equipment under a high-temperature and high-pressure water vapor working condition, and particularly relates to a method for generating a special anticorrosive protective film under a high-temperature and high-pressure dynamic water vapor working condition.
Background
In the industrial production, when equipment metal inner wall and high temperature high pressure steam contact under the high temperature high pressure steam operating mode, the Cl element can strengthen the oxidation under the highly compressed effect of high temperature, the oxidation film of metal inner wall is easily destroyed, the equipment inner wall is invaded like chloride ion by infringement ion in the steam easily, further cause the corruption, the anticorrosive film does not really play the anticorrosive action of steam thermodynamic equipment, the pipeline outer wall attenuate gradually, leak until perforating, shorten equipment life, the equipment maintenance cost increases, consequently, this patent proposes a generation method of special anticorrosive protection film under the dynamic steam operating mode of high temperature high pressure.
Disclosure of Invention
In order to overcome the problems in the background art, the invention provides a method for generating a special anticorrosive protective film under the working condition of high-temperature high-pressure dynamic water vapor, so that a compact protective film is generated on the inner wall of water vapor thermodynamic equipment, the corrosion of a metal pipe is prevented, and the service life of the equipment is prolonged.
In order to realize the purpose, the invention is realized by the following technical scheme:
the method for generating the special anticorrosive protective film under the working condition of high-temperature and high-pressure dynamic water vapor comprises the following steps of:
(1) Generating a high-temperature high-pressure water vapor working condition in related equipment, wherein the pressure and the flow of the water vapor working condition generate a fluctuating environment;
(2) Microgram caustic alkali strong electrolyte is added into a water vapor working condition environment through an intelligent microgram dosing device;
(3) Carrying out raw water pretreatment, primary desalting or reverse osmosis treatment, mixed ion exchange bed treatment or electrodialysis treatment on water vapor, and adjusting the dynamic balance of water vapor working condition environment distribution indexes;
(4) The inner wall or the surface of the related equipment through which the water vapor flows generates iron oxide or ferroferric oxide coating on the contact surface in the water vapor working condition environment and OH released by caustic alkali strong electrolyte - Reacting with ferric oxide or ferroferric oxide coating to generate FeOH (Fe) with a molecular formula 2 O 3 ·H 2 O) coating film.
Further, the method can be used for preparing a novel materialEarth, fe 2 O 3 Or Fe 3 O 4 The oxidation film generates FeOH (Fe) under the working condition of high-temperature, high-pressure and dynamic water vapor 2 O 3 ·H 2 O) the chemical mechanism is:
α-Fe 2 O 3 +H 2 O→2FeOH(Fe 2 O 3 ·H 2 O)；
α-Fe 3 O 4 +H 2 O+OH - +e→3FeOH(Fe 2 O 3 ·H 2 O)。
further, the ambient temperature of the water vapor working condition in the step (1) is 280-680 ℃, and the pressure is 13.7-28mpa.
Further, the working condition environment of the water vapor generating high temperature and high pressure in the step (1) is the environment of a boiler, a high temperature and high pressure steam pipeline or thermal equipment and the like.
Further, the environmental indexes of the water vapor working condition in the step (3) are that chloride ions are less than 400mg/L, sodium ions are less than or equal to 10mg/L, free iron ions are less than 10mg/L, silicon dioxide is less than or equal to 20mg/L, hydrogen conductivity is less than or equal to 0.3 muS/cm, and pH = 9-10.
The invention has the beneficial effects that:
the generation of the compact protective film on the inner wall of the water vapor thermodynamic equipment can effectively prevent the corrosion of metal pipes, not only can prolong the service life of the equipment, but also can prevent scaling, salt accumulation, pipe explosion and the like caused by corrosion, can effectively improve and guarantee the efficiency of a unit through water treatment, and indirectly realize the carbon neutralization of industrial stock.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding of the skilled person.
The method for generating the special anticorrosive protective film under the working condition of high-temperature and high-pressure dynamic water vapor comprises the following steps of:
(1) Generating a high-temperature high-pressure water vapor working condition in related equipment, wherein the pressure and the flow of the water vapor working condition generate a fluctuating environment;
(2) Adding microgram-level caustic alkali strong electrolyte into a water vapor working condition environment through an intelligent microgram-level dosing device;
(3) Carrying out raw water pretreatment, primary desalting or reverse osmosis treatment, mixed ion exchange bed treatment or electrodialysis treatment on water vapor, and adjusting the dynamic balance of water vapor working condition environment distribution indexes;
(4) The inner wall or surface of the related equipment through which the water vapor flows generates iron oxide or ferroferric oxide coating on the contact surface in the water vapor working condition environment, and OH released by caustic alkali strong electrolyte - Reacting with ferric oxide or ferroferric oxide coating to generate FeOH (Fe) with molecular formula 2 O 3 ·H 2 O) coating film.
Further, fe 2 O 3 Or Fe 3 O 4 The oxidation film generates FeOH (Fe) under the working condition of high-temperature, high-pressure and dynamic water vapor 2 O 3 ·H 2 O) the chemical mechanism is:
α-Fe 2 O 3 +H 2 O→2FeOH(Fe 2 O 3 ·H 2 O)；
α-Fe 3 O 4 +H 2 O+OH - +e→3FeOH(Fe 2 O 3 ·H 2 O)。
further, the ambient temperature of the water vapor working condition in the step (1) is 280-680 ℃, and the pressure is 13.7-28mpa.
Further, the working condition environment of the water vapor generating high temperature and high pressure in the step (1) is the environment of a boiler, a high temperature and high pressure steam pipeline or thermal equipment and the like.
Further, the water vapor working condition environmental indexes in the step (3) are that chloride ions are less than 400mg/L, sodium ions are less than or equal to 10mg/L, free iron ions are less than 10mg/L, silicon dioxide is less than or equal to 20mg/L, hydrogen conductivity is less than or equal to 0.3 muS/cm, and pH = 9-10.
Example 1
The method for generating the special anticorrosive protective film under the working condition of high-temperature and high-pressure dynamic water vapor comprises the following steps of:
(1) Generating a high-temperature high-pressure water vapor working condition in related equipment, wherein the pressure and the flow of the water vapor working condition generate a fluctuating environment;
(2) Microgram caustic alkali strong electrolyte is added into a water vapor working condition environment through an intelligent microgram dosing device;
(3) Carrying out raw water pretreatment, primary desalting or reverse osmosis treatment, mixed ion exchange bed treatment or electrodialysis treatment on water vapor, and adjusting the dynamic balance of water vapor working condition environment distribution indexes;
(4) The inner wall or surface of the related equipment through which the water vapor flows generates iron oxide or ferroferric oxide coating on the contact surface in the water vapor working condition environment, and OH released by caustic alkali strong electrolyte - Reacting with ferric oxide or ferroferric oxide coating to generate FeOH (Fe) with molecular formula 2 O 3 ·H 2 O) coating film.
Further, fe 2 O 3 Or Fe 3 O 4 The oxidation film generates FeOH (Fe) under the working condition of high-temperature, high-pressure and dynamic water vapor 2 O 3 ·H 2 O) the chemical mechanism is:
α-Fe 2 O 3 +H 2 O→2FeOH(Fe 2 O 3 ·H 2 O)；
α-Fe 3 O 4 +H 2 O+OH - +e→3FeOH(Fe 2 O 3 ·H 2 O)。
further, the ambient temperature of the water vapor working condition in the step (1) is 280 ℃, and the pressure is 13.7mpa.
Further, the working condition environment of the water vapor generating high temperature and high pressure in the step (1) is the environment of a boiler, a high temperature and high pressure steam pipeline or thermal equipment and the like.
Further, the environmental indexes of the water vapor working condition in the step (3) are that chloride ions are less than 400mg/L, sodium ions are less than or equal to 10mg/L, free iron ions are less than 10mg/L, silicon dioxide is less than or equal to 20mg/L, hydrogen conductivity is less than or equal to 0.3 muS/cm, and pH =9.
As a result: feOH (Fe) is formed 2 O 3 ·H 2 O) film coating, the film molecule is needle-shaped structure, claw-like FeOH (Fe) 2 O 3 ·H 2 O), degree of densification in comparison with Fe 2 O 3 Or Fe 3 O 4 The oxide film is 2 orders of magnitude higher, the adhesiveness is good, can prevent the corrosion of the high-temperature high-pressure apparatus inner wall or surface effectively.
Example 2
The method for generating the special anticorrosive protective film under the working condition of high-temperature and high-pressure dynamic water vapor comprises the following steps of:
(1) Generating a high-temperature high-pressure water vapor working condition in related equipment, wherein the pressure and the flow of the water vapor working condition generate a fluctuating environment;
(2) Adding microgram-level caustic alkali strong electrolyte into a water vapor working condition environment through an intelligent microgram-level dosing device;
(3) Carrying out raw water pretreatment, primary desalting or reverse osmosis treatment, mixed ion exchange bed treatment or electrodialysis treatment on water vapor, and adjusting the dynamic balance of water vapor working condition environment distribution indexes;
(4) The inner wall or surface of the related equipment through which the water vapor flows generates iron oxide or ferroferric oxide coating on the contact surface in the water vapor working condition environment, and OH released by caustic alkali strong electrolyte - Reacting with ferric oxide or ferroferric oxide coating to generate FeOH (Fe) with molecular formula 2 O 3 ·H 2 O) plating.
Further, fe 2 O 3 Or Fe 3 O 4 The oxidation film generates FeOH (Fe) under the working condition of high-temperature, high-pressure and dynamic water vapor 2 O 3 ·H 2 O) the chemical mechanism is:
α-Fe 2 O 3 +H 2 O→2FeOH(Fe 2 O 3 ·H 2 O)；
α-Fe 3 O 4 +H 2 O+OH - +e→3FeOH(Fe 2 O 3 ·H 2 O)。
further, the ambient temperature of the water vapor working condition in the step (1) is 480 ℃, and the pressure is 17mpa.
Further, the working condition environment of the water vapor generating high temperature and high pressure in the step (1) is the environment of a boiler, a high temperature and high pressure steam pipeline or thermodynamic equipment and the like.
Further, the environmental indexes of the water vapor working condition in the step (3) are that chloride ions are less than 400mg/L, sodium ions are less than or equal to 10mg/L, free iron ions are less than 10mg/L, silicon dioxide is less than or equal to 20mg/L, hydrogen conductivity is less than or equal to 0.3 muS/cm, and pH =9.5.
As a result: formation of FeOH (Fe) 2 O 3 ·H 2 O) film coating, the film molecule is needle-shaped structure, claw needle-shaped FeOH (Fe) 2 O 3 ·H 2 O), degree of densification in comparison with Fe 2 O 3 Or Fe 3 O 4 The oxide film is 2 orders of magnitude higher, the adhesiveness is good, can prevent the corrosion of the high-temperature high-pressure apparatus inner wall or surface effectively.
Example 3
The method for generating the special anticorrosive protective film under the working condition of high-temperature and high-pressure dynamic water vapor comprises the following steps of:
(1) Generating a high-temperature high-pressure water vapor working condition in related equipment, wherein the pressure and the flow of the water vapor working condition generate a fluctuating environment;
(2) Adding microgram-level caustic alkali strong electrolyte into a water vapor working condition environment through an intelligent microgram-level dosing device;
(3) Carrying out raw water pretreatment, primary desalting or reverse osmosis treatment, mixed ion exchange bed treatment or electrodialysis treatment on water vapor, and adjusting the dynamic balance of water vapor working condition environment distribution indexes;
(4) The inner wall or surface of the related equipment through which the water vapor flows generates iron oxide or ferroferric oxide coating on the contact surface in the water vapor working condition environment, and OH released by caustic alkali strong electrolyte - Reacting with ferric oxide or ferroferric oxide coating to generate FeOH (Fe) with molecular formula 2 O 3 ·H 2 O) coating film.
Further, fe 2 O 3 Or Fe 3 O 4 The oxidation film generates FeOH (Fe) under the working condition of high-temperature, high-pressure and dynamic water vapor 2 O 3 ·H 2 O) the chemical mechanism is:
α-Fe 2 O 3 +H 2 O→2FeOH(Fe 2 O 3 ·H 2 O)；
α-Fe 3 O 4 +H 2 O+OH - +e→3FeOH(Fe 2 O 3 ·H 2 O)。
further, the ambient temperature of the water vapor working condition in the step (1) is 680 ℃ and the pressure is 28mpa.
Further, the working condition environment of the water vapor generating high temperature and high pressure in the step (1) is the environment of a boiler, a high temperature and high pressure steam pipeline or thermodynamic equipment and the like.
Further, the environmental indexes of the water vapor working condition in the step (3) are that chloride ions are less than 400mg/L, sodium ions are less than or equal to 10mg/L, free iron ions are less than 10mg/L, silicon dioxide is less than or equal to 20mg/L, hydrogen conductivity is less than or equal to 0.3 muS/cm, and pH =10.
As a result: formation of FeOH (Fe) 2 O 3 ·H 2 O) film coating, the film molecule is needle-shaped structure, claw needle-shaped FeOH (Fe) 2 O 3 ·H 2 O), degree of densification in comparison with Fe 2 O 3 Or Fe 3 O 4 The oxide film is 2 orders of magnitude higher, the adhesiveness is good, can prevent the corrosion of the high-temperature high-pressure apparatus inner wall or surface effectively.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. The method for generating the special anticorrosive protective film under the high-temperature and high-pressure dynamic water vapor working condition is characterized by comprising the following steps of:
(1) Generating a high-temperature high-pressure water vapor working condition in related equipment, wherein the pressure and the flow of the water vapor working condition generate a fluctuating environment;
(2) Microgram caustic alkali strong electrolyte is added into a water vapor working condition environment through an intelligent microgram dosing device;
(3) Carrying out raw water pretreatment, primary desalting or reverse osmosis treatment, mixed ion exchange bed treatment or electrodialysis treatment on water vapor, and adjusting the dynamic balance of water vapor working condition environment distribution indexes;
(4) The inner wall or surface of the related equipment through which the water vapor flows generates iron oxide or ferroferric oxide coating on the contact surface in the water vapor working condition environment, and OH released by caustic alkali strong electrolyte - Reacting with ferric oxide or ferroferric oxide coating to generate FeOH (Fe) with a molecular formula 2 O 3 ·H 2 O) plating.
2. The method for generating the special anti-corrosion protective film under the high-temperature and high-pressure dynamic water vapor working condition according to claim 1, which is characterized by comprising the following steps of: fe 2 O 3 Or Fe 3 O 4 The oxidation film generates FeOH (Fe) under the working condition of high-temperature, high-pressure and dynamic water vapor 2 O 3 ·H 2 O) the chemical mechanism is:
α-Fe 2 O 3 +H 2 O→2FeOH(Fe 2 O 3 ·H 2 O)；
α-Fe 3 O 4 +H 2 O+OH - +e→3FeOH(Fe 2 O 3 ·H 2 O)。
3. the method for generating the special anti-corrosion protective film under the high-temperature high-pressure dynamic water vapor working condition according to claim 1, which is characterized by comprising the following steps of: the ambient temperature of the water vapor working condition in the step (1) is 280-680 ℃, and the pressure is 13.7-28mpa.
4. The method for generating the special anti-corrosion protective film under the high-temperature high-pressure dynamic water vapor working condition according to claim 1, which is characterized by comprising the following steps of: the working condition environment of the water vapor generating high temperature and high pressure in the step (1) is the environment of a boiler, a high temperature and high pressure steam pipeline or thermodynamic equipment and the like.
5. The method for generating the special anti-corrosion protective film under the high-temperature and high-pressure dynamic water vapor working condition according to claim 1, which is characterized by comprising the following steps of: and (4) in the step (3), the environmental indexes of the water vapor working condition are that chloride ions are less than 400mg/L, sodium ions are less than or equal to 10ug/L, free iron ions are less than 10ug/L, silicon dioxide is less than or equal to 20ug/L, hydrogen conductivity is less than or equal to 0.3 muS/cm, and pH is = 9-10.
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| CN202210928779.8A CN115216761A (en) | 2022-08-03 | 2022-08-03 | Method for generating special anti-corrosion protective film under high-temperature and high-pressure dynamic water vapor working condition |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109513356A (en) * | 2018-09-03 | 2019-03-26 | 云南聚杰环保科技有限公司 | A kind of industry Gamma Magnitude highly basic high-precision, full-automatic preparing process technology |
| CN114074982A (en) * | 2020-08-14 | 2022-02-22 | 云南聚杰环保科技有限公司 | Corrosion-prevention and scale-prevention technology for adding alkaline strong electrolyte into drum water of industrial drum furnace |
| CN114368822A (en) * | 2022-01-04 | 2022-04-19 | 云南聚杰环保科技有限公司 | Steam power source water vapor corrosion prevention, scale prevention and salt accumulation prevention control system and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109513356A (en) * | 2018-09-03 | 2019-03-26 | 云南聚杰环保科技有限公司 | A kind of industry Gamma Magnitude highly basic high-precision, full-automatic preparing process technology |
| CN114074982A (en) * | 2020-08-14 | 2022-02-22 | 云南聚杰环保科技有限公司 | Corrosion-prevention and scale-prevention technology for adding alkaline strong electrolyte into drum water of industrial drum furnace |
| CN114368822A (en) * | 2022-01-04 | 2022-04-19 | 云南聚杰环保科技有限公司 | Steam power source water vapor corrosion prevention, scale prevention and salt accumulation prevention control system and method |
Non-Patent Citations (1)
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| 冯丽军: "《工程材料》", 中国电力出版社, pages: 142 * |
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