CN114086187A - Comprehensive corrosion prevention protection method for high-salt water environment of wet slag removal system - Google Patents
Comprehensive corrosion prevention protection method for high-salt water environment of wet slag removal system Download PDFInfo
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- CN114086187A CN114086187A CN202111402366.8A CN202111402366A CN114086187A CN 114086187 A CN114086187 A CN 114086187A CN 202111402366 A CN202111402366 A CN 202111402366A CN 114086187 A CN114086187 A CN 114086187A
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- slag
- corrosion
- salt water
- removal system
- water environment
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- 239000002893 slag Substances 0.000 title claims abstract description 110
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005536 corrosion prevention Methods 0.000 title claims abstract description 18
- 238000005260 corrosion Methods 0.000 claims description 44
- 230000007797 corrosion Effects 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 239000011257 shell material Substances 0.000 description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000004210 cathodic protection Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Images
Classifications
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention discloses a comprehensive corrosion prevention protection method for a high-salt water environment of a wet slag removal system, which comprises the following steps: the method can realize comprehensive anticorrosion protection of the wet slag removal system in a high-salt water environment.
Description
Technical Field
The invention belongs to the field of energy conservation and environmental protection, and relates to a comprehensive corrosion prevention protection method for a high-salt water environment of a wet slag removal system.
Background
The high-salinity wastewater of the coal-fired power plant adopts pretreatment, concentration and decrement, evaporative crystallization or pretreatment and high-temperature flue gas evaporation, so that the investment and the operation cost are high, the evaporative crystallization has the problem of handling crystallized salt, flue gas solidification has the influence on the main flue and the flue gas treatment efficiency, and the solidified product treatment has certain environmental risk.
The scholars propose methods for delivering high-salinity wastewater to a wet slag removal system for consumption, such as patents CN202110020251.6, CN202010210181.6 and the like, but do not propose specific methods for comprehensive corrosion prevention of the high-salinity environment of the wet slag removal system. The chloride ions and the salt content of the high-salinity wastewater are high, the corrosivity of the high-salinity wastewater is further enhanced after the high-salinity wastewater is concentrated by the wet slag removal system, if the wet slag removal system does not adopt anticorrosion measures or the adopted anticorrosion measures are incomplete, the mechanical property of the components of the wet slag removal system is reduced after corrosion, and the current material condition of the wet slag removal system cannot be safely and stably operated in a high-salinity water environment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a comprehensive corrosion protection method for a wet slag removal system in a high-salt water environment, and the method can realize the comprehensive corrosion protection of the wet slag removal system in the high-salt water environment.
In order to achieve the aim, the comprehensive corrosion prevention protection method for the high-salt water environment of the wet slag removal system comprises the following steps: and performing anti-corrosion protection on the slag extractor shell, the shutoff door, the slag pump, the guide wheel in the slag extractor, the chain of the slag extractor, the scraper of the slag extractor and the slag bin.
The shell of the slag conveyor is subjected to anticorrosion protection in a mode of combining an anticorrosive coating and a corrosion-resistant and wear-resistant lining plate.
And the two side walls of the horizontal section of the dragveyer shell, the tail part of the dragveyer and the side walls of the slope section are subjected to anticorrosion protection by adopting an anticorrosion coating.
And the bottom of the horizontal section, the bottom of the slope section and the bottom of the chain returning section of the dragveyer shell are protected by a basalt stone lining bottom plate for corrosion prevention.
The door leaf of the shutoff door and the impeller of the slurry pump are made of corrosion-resistant steel.
The corrosion-resistant steel is 10CrMoAl steel.
And the scraper of the slag conveyor and the inner guide wheel of the slag conveyor are subjected to corrosion protection in a sacrificial anode cathode protection mode.
The sacrificial anode of the scraper is arranged at the root part of the scraper; the sacrificial anode of the guide wheel is arranged at the guide wheel hole.
The chain of the slag conveyor is made of anticorrosive materials.
The inner wall of the straight barrel section of the slag bin is subjected to anticorrosion protection by adopting anticorrosive paint, and the inner wall of the cone section of the slag bin is subjected to anticorrosion protection by adopting a mode of lining a corrosion-resistant wear-resistant steel plate.
The invention has the following beneficial effects:
the comprehensive corrosion prevention protection method for the high-salt water environment of the wet slag removal system is used for performing corrosion prevention protection on the slag remover shell, the turn-off door, the slag slurry pump, the guide wheel in the slag remover, the chain of the slag remover, the scraper of the slag remover and the slag bin during specific operation, so that the comprehensive corrosion prevention protection of the wet slag removal system in the high-salt water environment is realized, and the safe and stable operation of the current material condition of the wet slag removal system in the high-salt water environment is ensured.
Drawings
FIG. 1 is a block diagram of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the comprehensive corrosion protection method for high-salt water environment of the wet slag removal system comprises the following steps: and performing anti-corrosion protection on the slag dragging machine shell, the shutoff door, the slag pump, the inner guide wheel of the slag dragging machine, the chain of the slag dragging machine, the scraper of the slag dragging machine and the slag bin.
The method comprises the following specific steps:
1) the shell of the slag conveyor is subjected to anticorrosion protection in a mode of combining an anticorrosive coating and a corrosion-resistant and wear-resistant lining plate.
Specifically, aiming at the problems that the slag concentration of two side walls of the horizontal section of the slag salvaging machine shell, the tail part of the slag salvaging machine and the side wall of the slope section is low, and the friction between slag and materials is relatively small, the two side walls of the horizontal section of the slag salvaging machine shell, the tail part of the slag salvaging machine and the side wall of the slope section are subjected to anticorrosion protection by adopting an anticorrosion coating; aiming at the problems that the slag concentration at the bottom of the horizontal section of the slag salvaging machine shell, the bottom of the slope section and the bottom of the chain returning section is high, and the friction between slag and materials is relatively high, the bottom of the horizontal section of the slag salvaging machine shell, the bottom of the slope section and the bottom of the chain returning section are protected by a basalt stone lining bottom plate for corrosion prevention.
2) The door leaf of the shutoff door and the impeller of the slurry pump are made of corrosion-resistant steel, wherein the corrosion-resistant steel is 10CrMoAl steel.
3) Performing corrosion protection on a scraper of the slag conveyor and an inner guide wheel of the slag conveyor in a sacrificial anode cathodic protection manner, wherein the sacrificial anode of the scraper is arranged at the root of the scraper; the sacrificial anode of the guide wheel is arranged at the guide wheel hole, and the corrosion reduction of the wheel train and the scraper by the anticorrosion protection mode has a very obvious effect, can effectively prevent normal wear and is not influenced by high chloride ions, and the normal service life of the quick-wear part is ensured.
4) The chain of the slag salvaging machine is made of an anticorrosive material, wherein the anticorrosive material is Cr alloy.
5) Because the friction between the slag and the material on the inner wall of the straight barrel section of the slag bin is relatively small, the inner wall of the straight barrel section of the slag bin is subjected to anticorrosion protection by adopting an anticorrosive coating; the friction between the slag and the material of the slag bin cone section is relatively large, so that the inner wall of the cone section of the slag bin is subjected to corrosion protection in a corrosion-resistant and wear-resistant steel plate lining mode.
The anticorrosive paint is required to have low water (acid) absorption rate, high impermeability, compact surface structure, extremely low water (acid) absorption rate, high impermeability, water absorption rate of less than 0.3 percent and water vapor permeability coefficient of less than 5.0 multiplied by 10-14g·cm/(cm2s.Pa); the material has the characteristics of high temperature resistance and temperature change resistance, can resist the impact of which the glass transition temperature is up to 200 ℃, and still maintains the elastic modulus of more than 5.7GPa at 180 ℃; high bonding strength with the matrix, and bonding strength with the steel matrix is more than 10 MPa.
Example one
The two side walls of the horizontal section of the dragveyer shell, the tail part of the dragveyer and the side walls of the slope section are subjected to anticorrosion protection by adopting anticorrosion paint; the bottom of the horizontal section, the bottom of the slope section and the bottom of the chain returning section of the dragveyer shell are protected by a basalt stone lining bottom plate for corrosion prevention; the inner wall of the slag bin straight cylinder section is protected from corrosion by adopting anticorrosive paint, the inner wall of the slag bin cone section is protected from corrosion by adopting a corrosion-resistant wear-resistant steel lining plate, and after the anticorrosive measures are adopted, the surface of the coating is intact and has no corrosion under the conditions of water temperature of 60 ℃, pH of 9.0 and chloride ion of 20000 mg/L.
The thickness of the anticorrosive coatings on the two side walls of the horizontal section of the slag conveyor shell and the inner wall of the straight barrel section of the slag bin is more than or equal to 3mm, the thickness of the anticorrosive coatings on the tail part of the slag conveyor and the side wall of the slope section is more than or equal to 1.5mm, and the thickness of the basalt bottom plate is more than or equal to 40 mm.
Example two
Under the conditions that the temperature of slag water is 60 ℃, the pH value is 9.0 and the chloride ion is 20000mg/L, the corrosion rates of the scraper of the slag salvaging machine and the guide wheel in the slag salvaging machine are respectively 1.44mm/a and 0.82mm/a, and the service lives of the scraper of the slag salvaging machine and the guide wheel in the slag salvaging machine are less than 1 year according to the corrosion rates; the scraper of the slag salvaging machine and the inner guide wheel of the slag salvaging machine adopt a sacrificial anode cathodic protection mode for corrosion protection, after an aluminum anode is adopted, under the conditions of water temperature of 60 ℃, pH9.0 and chloride ion of 20000mg/L, the corrosion rate is respectively 0.32mm/a and 0.17mm/a which are far less than the abrasion rate, the slow release rate respectively reaches 76 percent and 88 percent, and the scraper of the slag salvaging machine and the inner guide wheel of the slag salvaging machine can safely operate.
In addition, all materials of the wet slag removal system are connected by conductors, under the conditions that the water temperature is 60 ℃, the pH value is 9.0 and the chloride ion is 20000mg/L, the corrosion rates of the shell material, the chain material and the shutoff door material are respectively 0.69mm/a, 0.23mm/a and 0.54mm/a, the anticorrosion protection is carried out by adopting a sacrificial anode cathodic protection mode, the corrosion rates are respectively reduced to 0.22mm/a, 0.03mm/a and 0.06mm/a, and the slow release rates respectively reach 68%, 83% and 88%.
Finally, the invention adopts an anticorrosion process combining an anticorrosion coating and a lining corrosion-resistant wear-resistant plate aiming at the environmental state (easy wear and difficult wear) of each part of the wet slag removal system, wherein the anticorrosion coating has simple field construction and low cost, but has relatively poor wear resistance; the lining corrosion-resistant wear-resistant plate is difficult to construct and high in manufacturing cost, but has good wear resistance, and the lining corrosion-resistant wear-resistant plate and the wear-resistant plate are combined, so that the modification workload can be reduced, the modification cost can be reduced, and the economy can be improved.
In addition, although the self-corrosion potentials of the scraper blade of the slag salvaging machine and the guide wheel in the slag salvaging machine are close to each other, the working environments of the scraper blade of the slag salvaging machine and the guide wheel in the slag salvaging machine are different, and the sacrificial anodes with different properties are selected aiming at the working environment that the scraper blade of the slag salvaging machine is immersed intermittently and the working environment that the guide wheel in the slag salvaging machine is immersed completely, so that the protection effects of the scraper blade of the slag salvaging machine and the guide wheel in the slag salvaging machine are improved.
The above description is only an example of the implementation steps of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A comprehensive corrosion prevention protection method for a high-salt water environment of a wet slag removal system is characterized by comprising the following steps: and performing anti-corrosion protection on the slag extractor shell, the shutoff door, the slag pump, the guide wheel in the slag extractor, the chain of the slag extractor, the scraper of the slag extractor and the slag bin.
2. The comprehensive corrosion protection method for the high-salt water environment of the wet slag removal system of claim 1, wherein a shell of the slag remover is subjected to corrosion protection by combining an anticorrosive coating and a corrosion-resistant and wear-resistant lining plate.
3. The comprehensive corrosion protection method for the high-salt water environment of the wet slag removal system according to claim 2, wherein the corrosion protection is performed by adopting corrosion-resistant paint on two side walls of the horizontal section of the slag salvaging machine shell, the tail part of the slag salvaging machine and the side walls of the slope section.
4. The comprehensive corrosion prevention protection method for the high-salt water environment of the wet slag removal system according to claim 3, wherein the corrosion prevention protection is performed on the bottom of the horizontal section of the slag remover shell, the bottom of the slope section and the bottom of the chain returning section by adopting a basalt stone lining bottom plate.
5. The method for comprehensive corrosion protection in a high-salt water environment of a wet slag removal system according to claim 1, wherein the door leaf of the shutoff door and the impeller of the slurry pump are made of corrosion-resistant steel.
6. The method for comprehensive corrosion protection in a high-salt water environment of a wet slag removal system according to claim 5, wherein the corrosion-resistant steel is 10CrMoAl steel.
7. The comprehensive corrosion protection method for the high-salt water environment of the wet slag removal system as claimed in claim 1, wherein the scraper of the slag remover and the inner guide wheel of the slag remover are protected from corrosion by sacrificial anode and cathode protection.
8. The method for comprehensively protecting the high-salt water environment from corrosion by the wet deslagging system of claim 7, wherein the sacrificial anode of the scraper is mounted at the root of the scraper; the sacrificial anode of the guide wheel is arranged at the guide wheel hole.
9. The method for comprehensive corrosion protection in high-salt water environment of the wet slag removal system according to claim 1, wherein the chain of the slag remover is made of a corrosion-resistant material.
10. The comprehensive corrosion prevention protection method for the high-salt water environment of the wet slag removal system according to claim 1, wherein the corrosion prevention protection is performed on the inner wall of the straight cylinder section of the slag bin by adopting a corrosion-resistant coating, and the corrosion prevention protection is performed on the inner wall of the cone section of the slag bin by adopting a corrosion-resistant wear-resistant steel plate lining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111402366.8A CN114086187A (en) | 2021-11-19 | 2021-11-19 | Comprehensive corrosion prevention protection method for high-salt water environment of wet slag removal system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111402366.8A CN114086187A (en) | 2021-11-19 | 2021-11-19 | Comprehensive corrosion prevention protection method for high-salt water environment of wet slag removal system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201555232U (en) * | 2009-10-15 | 2010-08-18 | 北京建筑工程学院 | Corrosion-proof and abrasion-proof scrapper slag remover |
| CN103801152A (en) * | 2014-02-26 | 2014-05-21 | 重庆鼎发铝加工有限责任公司 | Slag removal system |
| CN110002661A (en) * | 2019-04-28 | 2019-07-12 | 国电龙源电力技术工程有限责任公司 | Method for treating desulfurized wastewater and utilization wet slag removal evaporation disposition desulfurization wastewater device |
| US20190285311A1 (en) * | 2018-03-18 | 2019-09-19 | John Verhoff | Water container flushing system including sediment separator, sediment buster and associated methods |
| CN214664510U (en) * | 2020-12-30 | 2021-11-09 | 洛阳市达华非标准设备有限公司 | Anti-corrosion device of slag conveyor |
-
2021
- 2021-11-19 CN CN202111402366.8A patent/CN114086187A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201555232U (en) * | 2009-10-15 | 2010-08-18 | 北京建筑工程学院 | Corrosion-proof and abrasion-proof scrapper slag remover |
| CN103801152A (en) * | 2014-02-26 | 2014-05-21 | 重庆鼎发铝加工有限责任公司 | Slag removal system |
| US20190285311A1 (en) * | 2018-03-18 | 2019-09-19 | John Verhoff | Water container flushing system including sediment separator, sediment buster and associated methods |
| CN110002661A (en) * | 2019-04-28 | 2019-07-12 | 国电龙源电力技术工程有限责任公司 | Method for treating desulfurized wastewater and utilization wet slag removal evaporation disposition desulfurization wastewater device |
| CN214664510U (en) * | 2020-12-30 | 2021-11-09 | 洛阳市达华非标准设备有限公司 | Anti-corrosion device of slag conveyor |
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Application publication date: 20220225 |