CN115478278B - Cleaning corrosion inhibitor for aluminum alloy heat exchange tube of sea water desalination device and preparation method thereof - Google Patents
Cleaning corrosion inhibitor for aluminum alloy heat exchange tube of sea water desalination device and preparation method thereof Download PDFInfo
- Publication number
- CN115478278B CN115478278B CN202211171438.7A CN202211171438A CN115478278B CN 115478278 B CN115478278 B CN 115478278B CN 202211171438 A CN202211171438 A CN 202211171438A CN 115478278 B CN115478278 B CN 115478278B
- Authority
- CN
- China
- Prior art keywords
- heat exchange
- corrosion
- exchange tube
- aluminum alloy
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 119
- 230000007797 corrosion Effects 0.000 title claims abstract description 119
- 238000004140 cleaning Methods 0.000 title claims abstract description 50
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 49
- 239000003112 inhibitor Substances 0.000 title claims abstract description 39
- 239000013535 sea water Substances 0.000 title claims abstract description 33
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims description 11
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920001353 Dextrin Polymers 0.000 claims abstract description 18
- 239000004375 Dextrin Substances 0.000 claims abstract description 18
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 18
- 235000019425 dextrin Nutrition 0.000 claims abstract description 18
- VLCDUOXHFNUCKK-UHFFFAOYSA-N N,N'-Dimethylthiourea Chemical compound CNC(=S)NC VLCDUOXHFNUCKK-UHFFFAOYSA-N 0.000 claims abstract description 16
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims abstract description 16
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 96
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 10
- 150000007524 organic acids Chemical class 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 5
- 238000013329 compounding Methods 0.000 claims description 3
- 238000011033 desalting Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 16
- 230000005764 inhibitory process Effects 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 10
- 238000005554 pickling Methods 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 3
- 229910052782 aluminium Inorganic materials 0.000 abstract 3
- 230000000694 effects Effects 0.000 description 25
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 22
- 238000012544 monitoring process Methods 0.000 description 18
- 229910000019 calcium carbonate Inorganic materials 0.000 description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 10
- 239000002253 acid Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 7
- 239000000347 magnesium hydroxide Substances 0.000 description 7
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- VHSHLMUCYSAUQU-UHFFFAOYSA-N 2-hydroxypropyl methacrylate Chemical compound CC(O)COC(=O)C(C)=C VHSHLMUCYSAUQU-UHFFFAOYSA-N 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- FNAQSUUGMSOBHW-UHFFFAOYSA-H calcium citrate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O FNAQSUUGMSOBHW-UHFFFAOYSA-H 0.000 description 2
- 239000001354 calcium citrate Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- PHIQPXBZDGYJOG-UHFFFAOYSA-N sodium silicate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-][Si]([O-])=O PHIQPXBZDGYJOG-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 2
- 235000013337 tricalcium citrate Nutrition 0.000 description 2
- RZLVQBNCHSJZPX-UHFFFAOYSA-L zinc sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Zn+2].[O-]S([O-])(=O)=O RZLVQBNCHSJZPX-UHFFFAOYSA-L 0.000 description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 description 1
- HEMINMLPKZELPP-UHFFFAOYSA-N Phosdiphen Chemical compound C=1C=C(Cl)C=C(Cl)C=1OP(=O)(OCC)OC1=CC=C(Cl)C=C1Cl HEMINMLPKZELPP-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- -1 urea diphthalic acid Chemical compound 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
- 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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
-
- 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
Abstract
The application relates to the technical field of sea water desalination, in particular to a cleaning corrosion inhibitor for an aluminum alloy heat exchange tube of a sea water desalination device, which comprises the following components in percentage by weight: 0.2 to 0.5:0.1 to 0.2:0.1 to 0.2:0.02-0.05 of Ruobu, imidazoline, dimethyl thiourea, sodium dodecyl sulfate and dextrin, the balance is water, sulfamic acid below 4% is contained in the water, the aluminum heat exchange tube is compounded by adopting organic and inorganic corrosion inhibitors, corrosion inhibition efficiency of the aluminum heat exchange tube in the pickling process is effectively improved, the aluminum heat exchange tube is stable in use and small in consumption, the agent is simple to add and operate, the agent can be used in combination with an original system, external equipment and the system are not required to be added, and operation and control are simple.
Description
Technical Field
The application relates to the technical field of sea water desalination, in particular to a cleaning corrosion inhibitor for an aluminum alloy heat exchange tube of a sea water desalination device and a preparation method thereof.
Background
At present, the low-temperature multi-effect sea water desalination system is a main flow technology sea water desalination technology adopted in northern coastal areas, and particularly is combined with a thermal power plant to realize a 'cogeneration' mode, realize complementation of a power generation mode and a water production mode and realize zero opening of fresh water. The system generally utilizes low-quality steam to heat seawater to distill desalted water, a heating surface (mainly a tubular heat exchange effect body) is easy to scale after long-term operation, heat exchange of the system is affected, water production cost is increased, system efficiency is reduced, and safe, stable and economic operation cannot be realized. In order to avoid and reduce the influence of scaling of the heat exchange tube on the system, enhance the heat transfer effect of the system, reduce the energy consumption of water production, reduce the steam consumption and the water production cost, a chemical cleaning method is generally adopted to remove the scale and other corrosion products on the surface of the heat exchange tube, and the like.
The seawater desalination plant is generally cleaned every 2-3 years according to the running condition. The cleaning medium is typically an organic, inorganic acid, and a certain amount of corrosion inhibitor is added. The technology mainly adopts hydrochloric acid, sulfuric acid and sulfamic acid, and is supplemented with corrosion inhibitor, defoamer, surfactant and other chemical components, the heat exchange tube is washed by spraying from top to bottom in the effective body, the bottom water is recovered, the cleaning circulation pump is utilized for circulation cleaning, finally, the scale on the surface of the heat exchange tube is cleaned and stripped, the removal amount of the scale can reach more than 90%, and the test shows that the effect is obvious. In the chemical cleaning process, the components and distribution of the scale on the upper part of the heat exchange tube are determined. In the case of serious scale formation on the pipeline, especially in the case of indissolvable scale, the process of alkaline washing or neutral washing should be adopted. The waste liquid after washing is generally discharged or comprehensively treated after the subsequent treatment processes such as neutralization and the like.
At present, the commercial operation cases of the domestic large-scale low-temperature multi-effect sea water desalination system are fewer, the commercial operation cases are mostly combined with power plants or steel plants, the equipment is mostly imported products or produced by using foreign technology, the cleaning is still required along with the related content of foreign technical data, the cleaning times and experience are fewer, further digestion and autonomous innovation are not achieved, and a systematic chemical cleaning process flow and method are not formed. From the cleaning effect of the existing scheme, the phenomena of over-washing and under-washing caused by corrosion of the surface of the heat exchange tube or poor cleaning effect due to improper operation and control of the process flow in the cleaning process often occur, the cleaning process is not controlled due to unbalanced proportion and untimely detection of the cleaning agent, and the conditions of time consumption, medicine consumption, large wastewater yield and the like in the cleaning process are caused, so that the overall effect is not ideal.
In order to solve the technical problems, the application provides a cleaning corrosion inhibitor for an aluminum alloy heat exchange tube of a seawater desalination device and a preparation method thereof.
Disclosure of Invention
The application provides a chemical cleaning corrosion inhibitor for a low-temperature multi-effect sea water desalination device which is made of aluminum alloy material (model is 5052) and is used as a heat exchange tube.
The technical scheme adopted by the application for solving the technical problems is as follows: an aluminum alloy heat exchange tube cleaning corrosion inhibitor for a sea water desalination device comprises butyl acetate, imidazoline, dimethyl thiourea, sodium dodecyl sulfate, dextrin, organic acid and water;
the weight ratio of the sodium dodecyl sulfate to the dextrin is 1:0.2 to 0.5:0.1 to 0.2:0.1 to 0.2:0.02 to 0.05.
Further, the content of the organic acid in the corrosion inhibitor is less than or equal to 4 percent.
Further, the weight ratio of the butyl, the imidazoline, the dimethylthiourea, the sodium dodecyl sulfate and the dextrin is 1:0.3:0.1:0.1:0.02.
further, the organic acid is sulfamic acid and citric acid, and the compounding ratio of sulfamic acid to citric acid is 4:1.
The preparation method of the cleaning corrosion inhibitor for the aluminum alloy heat exchange tube of the sea water desalination device comprises the following steps of: 0.3:0.1:0.1:0.02 of butyl, imidazoline, dimethyl thiourea, sodium dodecyl sulfate and dextrin are dissolved in water, and sulfamic acid is added after full mixing and circulation are carried out.
Further, the content of sulfamic acid in the water is 2% -4%.
The application has the advantages that: the application provides a cleaning corrosion inhibitor for an aluminum alloy heat exchange tube of a seawater desalination device and a preparation method thereof, and the cleaning corrosion inhibitor has the following advantages:
the application provides a chemical cleaning corrosion inhibitor for a low-temperature multi-effect sea water desalination device taking an aluminum alloy material (model 5052) as a heat exchange tube, which is mainly used in an acid washing process by adopting sulfamic acid, and the formula (solid powder) of the corrosion inhibitor is as follows by mass ratio: if the butyl (composed of urea diphthalic acid, starch, salt, peregal or soap powder, the commercial products can be directly purchased), the imidazoline, the dimethyl thiourea and the sodium dodecyl sulfate, the weight ratio of the dextrin is 1:0.2-0.5:0.1-0.2:0.1-0.2:0.02-0.05, the application also provides a preparation method for the corrosion inhibitor, 2% -4% sulfamic acid is adopted as a main agent, the corrosion inhibitor is compounded according to the above proportion, the corrosion inhibitor is dissolved in water according to the concentration of about 1% of the agent before cleaning, and acid can be added after the corrosion inhibitor is fully mixed and circulated.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram showing the variation of the residual mass with the proportion of sulfamic acid in the mixed acid;
FIG. 2 is a graph showing the variation of the residual mass with the proportion of sulfamic acid;
FIG. 3 is a graphical representation of corrosion rate as a function of sulfamic acid concentration;
FIG. 4 is a graph showing the corrosion rate as a function of citric acid concentration;
FIG. 5 is a graphical representation of corrosion rate as a function of sulfamic acid concentration;
FIG. 6 is a graph showing the corrosion rate as a function of citric acid concentration.
Detailed Description
The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the application are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be noted that unless explicitly stated and limited otherwise, 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, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, but rather the terms "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Example 1:
an aluminum alloy heat exchange tube cleaning corrosion inhibitor for a sea water desalination device comprises butyl acetate, imidazoline, dimethyl thiourea, sodium dodecyl sulfate, dextrin, organic acid and water;
wherein if the weight ratio of butyl, imidazoline, dimethylthiourea, sodium dodecyl sulfate to dextrin = 1:0.2:0.1:0.1:0.02.
the content of organic acid in the corrosion inhibitor is less than or equal to 4 percent.
The application also provides a preparation method of the cleaning corrosion inhibitor for the aluminum alloy heat exchange tube of the seawater desalination device, which comprises the following steps of: 0.2:0.1:0.1:0.02 of if-butyl, imidazoline, dimethyl thiourea, sodium dodecyl sulfate and dextrin are dissolved in water, sulfamic acid is added after full mixing and circulation, and the content of sulfamic acid in the water is 2% -4%;
aluminum ring corrosion monitoring results: during the system cleaning, aluminum alloy corrosion monitoring hanging pieces are arranged at different positions at the 1-effect bottom, the corrosion behavior of the aluminum alloy heat exchange tube of the system is further examined, and the corrosion rate of each corrosion monitoring hanging piece is shown in the following table:
corrosion rate meter for aluminum alloy corrosion monitoring hanging piece:
wherein the 1 effect lower part A, the 1 effect lower part B and the 1 effect lower part C specifically refer to the lower part A, the lower part B and the lower part C of the effect body evaporator; as can be seen from the corrosion coupon monitoring results, the average corrosion rate of the 1-effect bottom aluminum alloy corrosion coupon during pickling was 0.2715 g/(m) 2 H), although the corrosion rate of the 1-effect all-part corrosion monitoring hanging piece is lower than the control requirement (2 g/(m) 2 H), but the overall corrosion rate of the effective body evaporator is 0.10-0.20 g/(m) of the previous year 2 H) is high.
Example 2:
an aluminum alloy heat exchange tube cleaning corrosion inhibitor for a sea water desalination device comprises butyl acetate, imidazoline, dimethyl thiourea, sodium dodecyl sulfate, dextrin, organic acid and water;
wherein if the weight ratio of butyl, imidazoline, dimethylthiourea, sodium dodecyl sulfate to dextrin = 1:0.3:0.1:0.1:0.02.
the application also provides a preparation method of the cleaning corrosion inhibitor for the aluminum alloy heat exchange tube of the seawater desalination device, which comprises the following steps of: 0.3:0.1:0.1:0.02, dissolving the butyl, the imidazoline, the dimethylthiourea, the sodium dodecyl sulfate and the dextrin in water, and adding the sulfamic acid after fully mixing and circulating;
further, the corrosion inhibitor contains 2% -4% of sulfamic acid.
Aluminum ring corrosion monitoring results: during the system cleaning, aluminum alloy corrosion monitoring hanging pieces are arranged at different positions at the 1-effect bottom, the corrosion behavior of the aluminum alloy heat exchange tube of the system is further examined, and the corrosion rate of each corrosion monitoring hanging piece is shown in the following table:
corrosion rate meter for aluminum alloy corrosion monitoring hanging piece:
wherein the 1 effect lower part A, the 1 effect lower part B and the 1 effect lower part C specifically refer to the lower part A, the lower part B and the lower part C of the effect body evaporator; as can be seen from the corrosion coupon monitoring results, the average corrosion rate of the 1-effect bottom aluminum alloy corrosion coupon during pickling was 0.2715 g/(m) 2 H), although the corrosion rate of the 1-effect all-part corrosion monitoring hanging piece is lower than the control requirement (2 g/(m) 2 H), but the overall corrosion rate of the effective body evaporator is 0.10-0.20 g/(m) of the previous year 2 H) is high.
Example 3:
an aluminum alloy heat exchange tube cleaning corrosion inhibitor for a sea water desalination device comprises butyl acetate, imidazoline, dimethyl thiourea, sodium dodecyl sulfate, dextrin, organic acid and water;
wherein if the weight ratio of butyl, imidazoline, dimethylthiourea, sodium dodecyl sulfate to dextrin = 1:0.5:0.2:0.2:0.05, wherein the corrosion inhibitor contains 2% -4% of sulfamic acid.
The application also provides a preparation method of the cleaning corrosion inhibitor for the aluminum alloy heat exchange tube of the seawater desalination device, which comprises the following steps of: 0.5:0.2:0.2:0.05 of if-butyl, imidazoline, dimethyl thiourea, sodium dodecyl sulfate and dextrin are dissolved in water, sulfamic acid is added after full mixing and circulation, and the content of sulfamic acid in the water is 2% -4%. Aluminum ring corrosion monitoring results: during the system cleaning, aluminum alloy corrosion monitoring hanging pieces are arranged at different positions at the 1-effect bottom, the corrosion behavior of the aluminum alloy heat exchange tube of the system is further examined, and the corrosion rate of each corrosion monitoring hanging piece is shown in the following table:
corrosion rate meter for aluminum alloy corrosion monitoring hanging piece:
wherein the 1 effect lower part A, the 1 effect lower part B and the 1 effect lower part C specifically refer to the lower part A, the lower part B and the lower part C of the effect body evaporator; as can be seen from the corrosion coupon monitoring results, the average corrosion rate of the 1-effect bottom aluminum alloy corrosion coupon during pickling was 0.2715 g/(m) 2 H), although the corrosion rate of the 1-effect all-part corrosion monitoring hanging piece is lower than the control requirement (2 g/(m) 2 H), but the overall corrosion rate of the effective body evaporator is 0.10-0.20 g/(m) of the previous year 2 H) is high.
Performance testing was performed on the cleaning corrosion inhibitors of the aluminum alloy heat exchange tubes of the seawater desalination plants of the above examples and comparative examples:
the method comprises the steps of adopting main reagents consisting of zinc sulfate heptahydrate, sodium silicate nonahydrate, EDP (50 wt%), PBTCA (50 wt%), HPMA (48 wt%) and SC210 (35 wt%), wherein the zinc sulfate heptahydrate and the sodium silicate nonahydrate are all analytically pure, the used HEDP (50 wt%), PBTCA (50 wt%), and HPMA (48 wt%) are all common chemicals, and an automatic liquid supplementing rotary hanging slice experimental instrument and a METTLER AL analytical balance are adopted as experimental instruments;
1. determination of corrosion inhibition properties:
the corrosion rate and the corrosion inhibition rate are measured, and the method is referred to in part 1 of the seawater cooling water treatment medicament performance evaluation method: the corrosion inhibition performance is measured, the material of the test piece is 5052 aluminum alloy standard corrosion test piece, the specification is 50mm multiplied by 25mm multiplied by 2mm, and the raw seawater for experiments is taken from a pretreatment sedimentation tank of a power plant. The experimental conditions are as follows: the temperature of the test solution is 40 ℃, the rotating speed is 80R/min, and the experimental period is 24 hours.
The corrosion behavior of the usual cleaning media on 5052 aluminum alloy was measured: the corrosion behavior of 8 commonly used cleaning mediums on 5052 aluminum alloy standard test pieces is studied under the same experimental conditions (medium temperature 20 ℃, medium concentration 4% and experimental time 17 h) by adopting a normal-temperature static corrosion experiment, and the results are shown in Table 1:
table 1: cleaning media screening
As can be seen from table 1, under the same experimental conditions, the corrosion strength sequence of the above eight cleaning media to the 5052 aluminum alloy test piece is: hydrochloric acid > EDTA tetrasodium > phosphoric acid > sulfuric acid > nitric acid > sulfamic acid > formic acid > citric acid; hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid and EDTA tetrasodium are strong in corrosiveness to the aluminum alloy, wherein the corrosion rate is as high as 57.43mm/a particularly when hydrochloric acid is used; if hydrochloric acid is adopted for cleaning, even if an efficient corrosion inhibitor is added, the corrosion of the aluminum alloy heat transfer tube is difficult to control; sulfamic acid, formic acid, citric acid are less corrosive to 5052 aluminum alloys. Meanwhile, as no solid precipitate is formed after the sulfamic acid is cleaned, and the citric acid has a certain inhibition effect on the corrosion of the aluminum alloy under the acidic condition, the sulfamic acid and the citric acid are used as main cleaning mediums.
2. Scale dissolution experiment:
preparing 100mL of sulfamic acid and citric acid mixed solution with mass volume concentration of 8%, adding calcium carbonate or magnesium hydroxide, stirring at a constant speed for 4-6 hours, filtering by using a G3 or G4 sand core funnel after the reaction is completed, then placing the funnel in an oven, drying for 2-4 hours at 110 ℃, cooling to room temperature, weighing the funnel mass by using a ten-thousandth balance, and calculating the residue mass by mass difference;
scale dissolution performance test of sulfamic acid and citric acid: according to the analysis result of the dirt components on the surface of the heat transfer pipe of the low-temperature multi-effect seawater desalination device, the dirt composition is mainly calcium carbonate or magnesium hydroxide. Therefore, pure calcium carbonate or magnesium hydroxide is selected as a research object, and the solubility of sulfamic acid and citric acid to the pure calcium carbonate or magnesium hydroxide is researched;
the dissolution properties of sulfamic acid and citric acid on calcium carbonate were tested: FIG. 1 is a graph showing the variation of the mass of the residue with the proportion of sulfamic acid in the mixed acid when the total concentration of sulfamic acid and citric acid is 8%, as shown in FIG. 1;
as can be seen from fig. 1, in the mixed cleaning medium in which the mass concentration of sulfamic acid and citric acid is 8%, the residual mass is significantly reduced as the sulfamic acid ratio is increased, indicating that increasing the sulfamic acid ratio facilitates the dissolution of calcium carbonate. When the sulfamic acid ratio reaches more than 80%, the curve is more gentle, and the residual mass change is relatively small. In addition, when the molar ratio of citrate to calcium carbonate is less than 3:2, water-insoluble complexes are readily formed, so that when the citric acid content in the mixed acid medium is high, substantial calcium citrate precipitation occurs, resulting in residual material levels that even exceed the initial calcium carbonate dosage. In sum, when the content of calcium carbonate in the scale sample to be cleaned is more, the sulfamic acid in the mixed acid medium accounts for more than or equal to 80 percent, so as to ensure the cleaning effect and avoid forming calcium citrate sediment;
the solubility of sulfamic acid and citric acid for magnesium hydroxide was tested: FIG. 2 is a graph showing the change of the residual mass with the proportion of sulfamic acid when the total concentration of sulfamic acid and citric acid is 8%, and as shown in FIG. 2, the residual mass increases with the increase of the proportion of sulfamic acid in the mixed cleaning medium with the concentration of sulfamic acid and citric acid of 8%, which indicates that the improvement of the citric acid ratio in the mixed acid medium is beneficial to the dissolution of magnesium hydroxide. Under the normal condition, the scaling type of the low-temperature multi-effect sea water desalination device mainly comprises calcium carbonate scale, so that the dissolution effect of sulfamic acid and citric acid on calcium carbonate and magnesium hydroxide is synthesized, and the compounding ratio of sulfamic acid and citric acid is selected to be 4:1.
The corrosion behavior of sulfamic acid and citric acid on 5052 aluminum alloy was measured: fig. 3 is a graph showing a change curve of the corrosion rate with the concentration of sulfamic acid, fig. 4 is a graph showing a change curve of the corrosion rate with the concentration of citric acid, fig. 5 is a graph showing a change curve of the corrosion rate with the concentration of sulfamic acid under the condition of 10% of fixed total concentration, fig. 6 is a graph showing a change curve of the corrosion rate with the concentration of citric acid under the condition of 4% of fixed sulfamic acid concentration, and as shown in fig. 3-6, compared with citric acid, the corrosion rate of 5052 aluminum alloy in sulfamic acid solution is obviously accelerated, and the influence of the change of the concentration of sulfamic acid and citric acid on the corrosion rate is relatively small. In a mixed acid medium, the corrosion rate is obviously reduced along with the increase of the citric acid ratio, 1% of citric acid is added into 4% of sulfamic acid solution, the corrosion rate of 5052 aluminum alloy is reduced from 1.46mm/a to 0.65mm/a, and the corrosion rate is reduced by about 55%. The compound ratio of sulfamic acid and citric acid is preferably 4:1 according to the research results of 2.1.2-2.1.3.
According to the research results, the corrosion of citric acid to 5052 aluminum alloy is less, corrosion is mainly caused by sulfamic acid, single sulfamic acid can be used for cleaning, and the concentration of free sulfamic acid is generally maintained to be 2% -4% in the pickling process according to the pickling operation procedure of the low-temperature multi-effect seawater desalination device. Therefore, 4% sulfamic acid is used as a cleaning medium, and a rotary hanging piece method is adopted, so that the corrosion inhibition effect of different corrosion inhibitors on 5052 aluminum alloy is studied.
Most of the commercial corrosion inhibitors at present have relatively poor corrosion inhibition effect, and only if the corrosion inhibitors are butyl and LX9-001 have obvious corrosion inhibition effect. Compared with the prior art, if Ding Huanshi is better, the corrosion inhibition rate can reach more than 90 percent. At a concentration of 1.0%, the corrosion inhibition rate is about 84%. Thereafter, as the concentration of if-butyl increases, the corrosion inhibition rate slightly increases. When the concentration is 2.0%, the corrosion inhibition rate is more than or equal to 90%, and the three organic phosphorus scale inhibitors in the prior art have the best HPAA corrosion inhibition performance, and are more obvious especially in low concentration. When the HPAA concentration is 250mg/L, the corrosion inhibition rate is close to 90%. In addition, other four types of organic phosphorus except HPAA are easy to form a white deposition film on the surface of the 5052 aluminum alloy, and can not be completely removed by acid washing with concentrated nitric acid, so that the aluminum alloy has better corrosion inhibition effect on the 5052 aluminum alloy.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (3)
1. An aluminum alloy heat exchange tube cleaning corrosion inhibitor for a sea water desalting device is characterized in that: comprises butyl, imidazoline, dimethyl thiourea, sodium dodecyl sulfate, dextrin, organic acid and water;
the weight ratio of the sodium dodecyl sulfate to the dextrin is 1:0.3:0.1:0.1:0.02;
the organic acid is sulfamic acid and citric acid, and the compounding ratio of sulfamic acid to citric acid is 4:1;
the preparation method of the cleaning corrosion inhibitor for the aluminum alloy heat exchange tube based on the sea water desalting device comprises the following steps of: 0.3:0.1:0.1:0.02 of butyl, imidazoline, dimethyl thiourea, sodium dodecyl sulfate and dextrin are dissolved in water, and sulfamic acid is added after full mixing and circulation are carried out.
2. The corrosion inhibitor for cleaning an aluminum alloy heat exchange tube of a sea water desalination device according to claim 1, which is characterized in that: the content of organic acid in the corrosion inhibitor is less than or equal to 4 percent.
3. The corrosion inhibitor for cleaning an aluminum alloy heat exchange tube of a sea water desalination device according to claim 1, which is characterized in that: the content of sulfamic acid in the water is 2% -4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211171438.7A CN115478278B (en) | 2022-09-26 | 2022-09-26 | Cleaning corrosion inhibitor for aluminum alloy heat exchange tube of sea water desalination device and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211171438.7A CN115478278B (en) | 2022-09-26 | 2022-09-26 | Cleaning corrosion inhibitor for aluminum alloy heat exchange tube of sea water desalination device and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115478278A CN115478278A (en) | 2022-12-16 |
| CN115478278B true CN115478278B (en) | 2023-12-01 |
Family
ID=84394130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211171438.7A Active CN115478278B (en) | 2022-09-26 | 2022-09-26 | Cleaning corrosion inhibitor for aluminum alloy heat exchange tube of sea water desalination device and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115478278B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4370256A (en) * | 1977-01-17 | 1983-01-25 | The Dow Chemical Company | Corrosion inhibitor for aluminum in aqueous acids |
| CN103774159A (en) * | 2014-01-14 | 2014-05-07 | 河北省科学院能源研究所 | Formula of aluminum material acid-washing corrosion inhibitor and preparation method for aluminum material acid-washing corrosion inhibitor |
| CN104498967A (en) * | 2014-12-31 | 2015-04-08 | 苏州禾川化学技术服务有限公司 | Multifunctional aluminum material corrosion-inhibition polishing pickling agent |
| CN106400035A (en) * | 2016-11-16 | 2017-02-15 | 武汉奥克特种化学有限公司 | Acidic degreasing and derusting liquid prepared by utilizing industrial wastewater and preparation method of acidic degreasing and derusting liquid |
| CN113293386A (en) * | 2021-05-28 | 2021-08-24 | 西安热工研究院有限公司 | Chemical cleaning agent for insoluble scale of seawater desalination device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE367432T1 (en) * | 2001-11-09 | 2007-08-15 | Jiro Sakurai | DETERGENT FOR METALLIC PRODUCT |
-
2022
- 2022-09-26 CN CN202211171438.7A patent/CN115478278B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4370256A (en) * | 1977-01-17 | 1983-01-25 | The Dow Chemical Company | Corrosion inhibitor for aluminum in aqueous acids |
| CN103774159A (en) * | 2014-01-14 | 2014-05-07 | 河北省科学院能源研究所 | Formula of aluminum material acid-washing corrosion inhibitor and preparation method for aluminum material acid-washing corrosion inhibitor |
| CN104498967A (en) * | 2014-12-31 | 2015-04-08 | 苏州禾川化学技术服务有限公司 | Multifunctional aluminum material corrosion-inhibition polishing pickling agent |
| CN106400035A (en) * | 2016-11-16 | 2017-02-15 | 武汉奥克特种化学有限公司 | Acidic degreasing and derusting liquid prepared by utilizing industrial wastewater and preparation method of acidic degreasing and derusting liquid |
| CN113293386A (en) * | 2021-05-28 | 2021-08-24 | 西安热工研究院有限公司 | Chemical cleaning agent for insoluble scale of seawater desalination device |
Non-Patent Citations (1)
| Title |
|---|
| 新型循环水冷却系统清洗剂的研究;王艳芬;;科技情报开发与经济(第15期);第131-132、135页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115478278A (en) | 2022-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7300542B2 (en) | Method for inhibiting calcium salt scale | |
| CN103469222B (en) | A kind of condensing equipment scale descaling agent and descaling method | |
| CN101864575A (en) | Special cleaning agent for stainless steel equipment and use method thereof | |
| CN102127773B (en) | Phosphorus-free precleaning prefilming agent and cleaning process | |
| CN102464410B (en) | Novel environmentally-friendly corrosion/scale inhibitor | |
| CN106566677B (en) | A kind of the cleaning dispersing agent and preparation method of the scale removal of oil field oil pipeline on-line cleaning | |
| CN115478278B (en) | Cleaning corrosion inhibitor for aluminum alloy heat exchange tube of sea water desalination device and preparation method thereof | |
| CN103915950A (en) | Cleaning technology of generator rotor water cooling system | |
| CN114045188A (en) | Neutral environment-friendly cleaning agent and preparation method and application thereof | |
| CN112853364B (en) | Condenser manganese scale chemical cleaning agent | |
| CN113415876A (en) | Scale remover for leachate anaerobic system and preparation method thereof | |
| CN104129862A (en) | Cleaning agent for removing boiler silicon scale | |
| CN112815767B (en) | Cleaning method of seawater desalination device | |
| CN103834956B (en) | Clean-out system of a kind of household heating system for being made up of various metals material and preparation method thereof | |
| CN104451247A (en) | Nano-particle reinforced alloy material with antiscaling function as well as preparation method and application of nano-particle reinforced alloy material | |
| CN106191876A (en) | A kind of Cleaning and Passivation method of heat-exchange system equipment | |
| CN106367762B (en) | Thermal power plant condenser formic acid complex cleaning and washing agent | |
| CN113881517A (en) | Heat exchanger scale cleaning agent, preparation method and use method | |
| CN105112929B (en) | Station boiler is hot quickly washes silicon prefilming agent | |
| CN107525432A (en) | A kind of method that concentrated wet-process phosphoric acid is cleaned with graphite heat exchanger | |
| Tahir et al. | Experimental study of chemical de-scaling-I: Effect of acid concentration | |
| CN113789227B (en) | Calcium sulfate scale cleaning agent suitable for aluminum alloy heat transfer tube and preparation method and application thereof | |
| KR930004559B1 (en) | Method for removal of patina | |
| CN215463348U (en) | Dissolving kettle for preparing sulfamic acid | |
| CN115418277B (en) | Calcium sulfate scale cleaning agent for evaporative crystallizer and preparation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |