CN111778510A - Corrosion prevention process for adding corrosion inhibitor to ultra-high temperature heat supply system - Google Patents
Corrosion prevention process for adding corrosion inhibitor to ultra-high temperature heat supply system Download PDFInfo
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- CN111778510A CN111778510A CN202010694507.7A CN202010694507A CN111778510A CN 111778510 A CN111778510 A CN 111778510A CN 202010694507 A CN202010694507 A CN 202010694507A CN 111778510 A CN111778510 A CN 111778510A
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- corrosion
- corrosion inhibitor
- high temperature
- ultra
- prevention process
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- 238000005260 corrosion Methods 0.000 title claims abstract description 61
- 230000007797 corrosion Effects 0.000 title claims abstract description 58
- 239000003112 inhibitor Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005536 corrosion prevention Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- -1 imidazoline cyclic amine compound Chemical class 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 239000000498 cooling water Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 13
- 239000003814 drug Substances 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000012267 brine Substances 0.000 claims description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 2
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 13
- 239000010962 carbon steel Substances 0.000 abstract description 13
- 239000010935 stainless steel Substances 0.000 abstract description 10
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 239000002736 nonionic surfactant Substances 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 239000003093 cationic surfactant Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 231100000344 non-irritating Toxicity 0.000 description 2
- 231100000956 nontoxicity Toxicity 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000005303 weighing Methods 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
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
Abstract
The invention relates to the technical field of corrosion prevention of a remote ultra-high temperature heating system, in particular to a corrosion prevention process for adding a corrosion inhibitor to an ultra-high temperature heating system, which aims to overcome the defects of the prior art, provides a corrosion prevention process for adding a corrosion inhibitor to an ultra-high temperature heating system and mainly solves the corrosion problem of carbon steel, 316L and 317L stainless steel in a high-temperature heating network system with the water temperature close to 140 ℃; the method is characterized by comprising the steps of preparing a corrosion inhibitor and adding the prepared corrosion inhibitor into a cooling water system; in the step (1), the corrosion inhibitor is formed by mixing an imidazoline cyclic amine compound, PBTCA and a penetrating agent JFC, and the concentration of the imidazoline cyclic amine compound in the corrosion inhibitor is 10-30 mg/L; the beneficial effects are that: after the treatment by the process, the uniform corrosion rate of the carbon steel is about one percent of that of the carbon steel without adding the chemicals, the pitting corrosion of the carbon steel, 316L and 317L stainless steel is effectively inhibited, and the corrosion problem of a high-temperature heating system is fundamentally solved.
Description
Technical Field
The invention relates to the technical field of corrosion prevention of a remote ultrahigh-temperature heat supply system, in particular to a corrosion prevention process for adding a corrosion inhibitor to an ultrahigh-temperature heat supply system.
Background
The central heating of the urban heat supply network is a trend at present, more and more thermal power plants far away from the urban area provide long-distance heating for the urban area in winter, and the technical requirement is that the supply water temperature of a primary network and a secondary network is the highest and close.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an anticorrosion process for adding a corrosion inhibitor to an ultrahigh-temperature heat supply system, and mainly solves the corrosion problem of carbon steel, 316L stainless steel and 317L stainless steel in a high-temperature heat supply network system with the water temperature close to 140 ℃ so as to ensure the normal operation of the system, the safe production and the stable heating.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-corrosion process for adding a corrosion inhibitor to an ultrahigh-temperature heat supply system is characterized by comprising the following steps of:
step (1): preparing a corrosion inhibitor;
step (2): adding the corrosion inhibitor prepared in the step (1) into a cooling water system;
in the step (1), the corrosion inhibitor is formed by mixing an imidazoline cyclic amine compound, PBTCA and a penetrating agent JFC, and the concentration of the imidazoline cyclic amine compound in the corrosion inhibitor is 10-30 mg/L.
In the step (1), the preparation method of the corrosion inhibitor comprises the following steps:
step (a): 1 cubic of saline water is injected into the medicine adding tank, and an electric heater is started to heat;
step (b): opening a cover plate at the top of the medicine adding tank, adding 75 kg of PBTCA, and starting a stirrer to stir;
step (c): adding 20 kg of imidazoline cycloamine compound, and stirring;
step (d): adding 5 kg of penetrating agent JFC, and stirring;
wherein, in the step (1), the pH value of the prepared corrosion inhibitor is 8.5-11.0.
In the step (2), dosing is carried out by using a metering pump, and the flow rate of the metering pump is controlled to be 1.0L/min.
In step (a), the brine temperature is heated to 50 ℃.
In step (b), the stirring time of the stirrer was 20 minutes.
In step (c), the stirring time of the stirrer was 1 hour.
In step (d), the stirring time of the stirrer was 30 minutes.
The chemical structural formula of the imidazoline cyclic amine compound is shown in figure 1, and the imidazoline cyclic amine compound is a brown paste which is a strong alkaline low-melting-point solid; can be dissolved in most organic solvents, has the characteristics of no toxicity, high biodegradation and the like, and also has the capability of sterilization and disinfection; more importantly, it is non-irritating to the skin and eyes; it is stable in both acidic and alkaline medium, and can be compatible with anionic, cationic and nonionic surfactants.
The PBTCA is named as 2-phosphate-1, 2, 4-tricarboxylic acid butane in the Chinese name, is colorless or light yellow transparent liquid and is acidic; has good high temperature resistance, oxidation resistance and chlorine resistance stability, and has good dispersion performance for circulating water with high turbidity and high iron.
The penetrating agent JFC is fully called fatty alcohol-polyoxyethylene ether and belongs to a nonionic surfactant; the penetrant is a substance which has the function of penetration, has fixed hydrophilic and lipophilic groups, can be directionally arranged on the surface of a solution, and can obviously reduce the surface tension.
The invention has the beneficial effects that: after the treatment by the process, the uniform corrosion rate of the carbon steel is about one percent of that of the carbon steel without adding the chemicals, the pitting corrosion of the carbon steel, 316L and 317L stainless steel is effectively inhibited, and the corrosion problem of a high-temperature heating system is fundamentally solved.
Drawings
FIG. 1 shows the chemical formula of the imidazoline-based cyclic amine compound of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
An anti-corrosion process for adding a corrosion inhibitor to an ultrahigh-temperature heat supply system is characterized by comprising the following steps of:
step (1): preparing a corrosion inhibitor;
step (2): adding the corrosion inhibitor prepared in the step (1) into a cooling water system;
in the step (1), the corrosion inhibitor is formed by mixing an imidazoline cyclic amine compound, PBTCA and a penetrating agent JFC, and the concentration of the imidazoline cyclic amine compound in the corrosion inhibitor is 10-30 mg/L.
In the step (1), the preparation method of the corrosion inhibitor comprises the following steps:
step (a): injecting 1 cubic of saline water into the medicine adding tank, starting an electric heater for heating, and heating the saline water to 50 ℃;
step (b): opening a cover plate at the top of the medicine adding tank, adding 75 kg of PBTCA, starting a stirrer to stir for 20 minutes;
step (c): adding 20 kg of imidazoline cycloamine compound, and stirring for 1 hour;
step (d): 5 kg of penetrating agent JFC is added and stirred for 30 minutes.
In the step (2), dosing is carried out by using a metering pump, and the flow rate of the metering pump is controlled to be 1.0L/min.
Wherein, in the step (1), the pH value of the prepared corrosion inhibitor is 8.5-11.0.
The chemical structural formula of the imidazoline cyclic amine compound is shown in figure 1, and the imidazoline cyclic amine compound is a brown paste which is a strong alkaline low-melting-point solid; can be dissolved in most organic solvents, has the characteristics of no toxicity, high biodegradation and the like, and also has the capability of sterilization and disinfection; more importantly, it is non-irritating to the skin and eyes; it is stable in both acidic and alkaline medium, and can be compatible with anionic, cationic and nonionic surfactants.
The PBTCA is named as 2-phosphate-1, 2, 4-tricarboxylic acid butane in the Chinese name, is colorless or light yellow transparent liquid and is acidic; has good high temperature resistance, oxidation resistance and chlorine resistance stability, and has good dispersion performance for circulating water with high turbidity and high iron.
The penetrating agent JFC is fully called fatty alcohol-polyoxyethylene ether and belongs to a nonionic surfactant; the penetrant is a substance which has the function of penetration, has fixed hydrophilic and lipophilic groups, can be directionally arranged on the surface of a solution, and can obviously reduce the surface tension.
Experimental example 1:
the test was carried out in a high temperature heating system with a water temperature close to 140 ℃. Before the corrosion inhibitor is added, carbon steel in the system is seriously corroded, and a large amount of pitting corrosion occurs on 316L and 317L stainless steel plate type heat exchange sheets in the heat exchanger, so that heat supply to users in winter is seriously influenced.
Evaluation of the effect after adding the corrosion inhibitor:
in order to verify the effect of the corrosion inhibitor, the corrosion inhibitor is added into the high-temperature heat supply network system from 2019, and the concentration of the corrosion inhibitor is 40 mg/L.
The field hanging test is carried out for 92 days (2208 hours) in the heat network bypass sample hanging device from 1 month and 14 days to 4 months and 17 days in 2020. Two each of 2 pieces of treated Q235B carbon steel, 316L and 317L stainless steel coupons were suspended in the bypass. And (4) after the field listing test is finished, processing and weighing the corrosion hanging piece, and calculating the corrosion rate. The test results are shown in table 1 below.
TABLE 1 statistical table of corrosion rates of heat supply network bypass coupon test materials (unit, mm/a)
| Numbering | Carbon steel | 316L stainless steel | 317L stainless steel |
| #1 | 0.017016 | 0.000603 | 0.000365 |
| #2 | 0.034232 | 0.000439 | 0.000163 |
| Mean value of | 0.025624 | 0.000521 | 0.000264 |
The test result shows that: after the treatment of the process, the uniform corrosion rate of the carbon steel is about one percent of that of the carbon steel without adding the chemicals, the pitting corrosion of 316L and 317L stainless steel is effectively inhibited, and the corrosion problem of a high-temperature heating system is fundamentally solved.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. An anti-corrosion process for adding a corrosion inhibitor to an ultrahigh-temperature heat supply system is characterized by comprising the following steps of:
step (1): preparing a corrosion inhibitor;
step (2): adding the corrosion inhibitor prepared in the step (1) into a cooling water system;
in the step (1), the corrosion inhibitor is formed by mixing an imidazoline cyclic amine compound, PBTCA and a penetrating agent JFC, and the concentration of the imidazoline cyclic amine compound in the corrosion inhibitor is 10-30 mg/L.
2. The corrosion prevention process for adding the corrosion inhibitor to the ultra-high temperature heating system according to claim 1, wherein in the step (1), the preparation method of the corrosion inhibitor comprises the following steps:
step (a): 1 cubic of saline water is injected into the medicine adding tank, and an electric heater is started to heat;
step (b): opening a cover plate at the top of the medicine adding tank, adding 75 kg of PBTCA, and starting a stirrer to stir;
step (c): adding 20 kg of imidazoline cycloamine compound, and stirring;
step (d): 5 kg of penetrant JFC is added and stirred.
3. The corrosion prevention process for adding the corrosion inhibitor to the ultra-high temperature heat supply system according to claim 1, wherein in the step (1), the pH value of the prepared corrosion inhibitor is 8.5-11.0.
4. The corrosion prevention process of the ultra-high temperature heat supply system with the corrosion inhibitor according to claim 1, wherein in the step (2), the dosing is performed by using a metering pump, and the flow rate of the metering pump is controlled to be 1.0L/min.
5. The corrosion prevention process of the super high temperature heat supply system with the corrosion inhibitor according to claim 2, wherein in the step (a), the temperature of the brine is heated to 50 ℃.
6. The corrosion prevention process of the ultra-high temperature heating system with the corrosion inhibitor according to claim 2, wherein in the step (b), the stirring time of the stirrer is 20 minutes.
7. The corrosion prevention process of the ultra-high temperature heating system with the corrosion inhibitor according to claim 2, wherein in the step (c), the stirring time of the stirrer is 1 hour.
8. The corrosion prevention process of the ultra-high temperature heating system with the corrosion inhibitor according to claim 2, wherein in the step (d), the stirring time of the stirrer is 30 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010694507.7A CN111778510A (en) | 2020-07-17 | 2020-07-17 | Corrosion prevention process for adding corrosion inhibitor to ultra-high temperature heat supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010694507.7A CN111778510A (en) | 2020-07-17 | 2020-07-17 | Corrosion prevention process for adding corrosion inhibitor to ultra-high temperature heat supply system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965090A (en) * | 2012-10-10 | 2013-03-13 | 西北大学 | Corrosion inhibitor composition |
| US20150240365A1 (en) * | 2014-02-27 | 2015-08-27 | Ecolab Usa Inc. | Quaternary fatty acid esters as corrosion inhibitors |
| CN105165835A (en) * | 2015-10-15 | 2015-12-23 | 西安西热电站化学科技有限公司 | Ocean water once-through cooling system marine organism inhibitor and preparation method |
| CN107777789A (en) * | 2016-08-29 | 2018-03-09 | 中国石油化工股份有限公司 | Low-phosphor efficient anti-incrustation corrosion inhibitor for circulating water treatment and preparation method thereof |
| CN111377550A (en) * | 2020-04-23 | 2020-07-07 | 西安热工研究院有限公司 | Scale and corrosion inhibitor for ultra-high temperature heat supply network system |
-
2020
- 2020-07-17 CN CN202010694507.7A patent/CN111778510A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965090A (en) * | 2012-10-10 | 2013-03-13 | 西北大学 | Corrosion inhibitor composition |
| US20150240365A1 (en) * | 2014-02-27 | 2015-08-27 | Ecolab Usa Inc. | Quaternary fatty acid esters as corrosion inhibitors |
| CN105165835A (en) * | 2015-10-15 | 2015-12-23 | 西安西热电站化学科技有限公司 | Ocean water once-through cooling system marine organism inhibitor and preparation method |
| CN107777789A (en) * | 2016-08-29 | 2018-03-09 | 中国石油化工股份有限公司 | Low-phosphor efficient anti-incrustation corrosion inhibitor for circulating water treatment and preparation method thereof |
| CN111377550A (en) * | 2020-04-23 | 2020-07-07 | 西安热工研究院有限公司 | Scale and corrosion inhibitor for ultra-high temperature heat supply network system |
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Application publication date: 20201016 |