CN113789518A - Heat exchanger cleaning agent capable of cleaning rust - Google Patents
Heat exchanger cleaning agent capable of cleaning rust Download PDFInfo
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- CN113789518A CN113789518A CN202110914982.5A CN202110914982A CN113789518A CN 113789518 A CN113789518 A CN 113789518A CN 202110914982 A CN202110914982 A CN 202110914982A CN 113789518 A CN113789518 A CN 113789518A
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- acid solution
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- hydrochloric acid
- heat exchanger
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000012459 cleaning agent Substances 0.000 title claims abstract description 34
- 238000004140 cleaning Methods 0.000 title claims abstract description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 106
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 27
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims abstract description 25
- 229910001626 barium chloride Inorganic materials 0.000 claims abstract description 25
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical class [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 22
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims abstract description 14
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 7
- 235000013024 sodium fluoride Nutrition 0.000 claims abstract description 7
- 235000010265 sodium sulphite Nutrition 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract 2
- 239000000243 solution Substances 0.000 claims description 66
- 238000000034 method Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005406 washing Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 27
- 229910052742 iron Inorganic materials 0.000 description 11
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 10
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 10
- 239000000126 substance Substances 0.000 description 7
- 241000221535 Pucciniales Species 0.000 description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 5
- 229910003641 H2SiO3 Inorganic materials 0.000 description 5
- 229910021577 Iron(II) chloride Inorganic materials 0.000 description 5
- 239000007832 Na2SO4 Substances 0.000 description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- 150000001491 aromatic compounds Chemical class 0.000 description 5
- 239000003085 diluting agent Substances 0.000 description 5
- 239000004519 grease Substances 0.000 description 5
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 5
- 239000003960 organic solvent Substances 0.000 description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 description 5
- 229910052911 sodium silicate Inorganic materials 0.000 description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 description 5
- 239000012530 fluid Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000006467 substitution reaction 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
- 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
- C23G1/08—Iron or steel
- C23G1/085—Iron or steel solutions containing HNO3
-
- 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
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
- C23G5/032—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents containing oxygen-containing compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a heat exchanger cleaning agent capable of cleaning rusty materials, which comprises the following components: 4-10 parts of saturated ferrous sulfate; 1-4 parts of a synergist; 15-20 parts of a nitric acid solution; 30-40 parts of a hydrochloric acid solution; 15-20 parts of barium chloride; 50-80 parts of water; 3-5 parts of ethanol, preferably, the concentration of the nitric acid solution and the hydrochloric acid solution is 5-10%, preferably, the synergist is formed by mixing sodium fluoride and sodium sulfite in a ratio of 3:5, and preferably, the water needs softened water. This can wash heat exchanger cleaner of rust matter, through barium chloride, nitric acid solution, hydrochloric acid solution's use, get rid of various incrustations earlier, increase hydrochloric acid and the area of contact of rust, rust cleaning efficiency and effect have been improved, it is cleaner to make the heat exchanger abluent, this can wash heat exchanger cleaner of rust matter, through sneaking into saturated ferrous sulfate in the prescription, after the washing is accomplished and is discharged the cleaner, the remaining saturated ferrous sulfate of equipment inner wall and hydrochloric acid solution expose and react in the air, prevent to remain hydrochloric acid solution and continue to corrode the equipment inner wall.
Description
Technical Field
The invention relates to the technical field of rust removal of heat exchangers, in particular to a heat exchanger cleaning agent capable of cleaning rust.
Background
The heat exchanger is a device for transferring partial heat of hot fluid to cold fluid, is used as a condenser in industrial and chemical production, is a main part for maintaining long-time operation of the device, and can greatly improve the production efficiency.
Because water continuously flows in a circulating manner in the heat exchanger, water with rich oxygen can react with iron in the heat exchanger to generate rust, and the rust can not only influence water flow circulation, but also reduce heat exchange efficiency, so that the problem can be solved by providing the heat exchanger cleaning agent capable of cleaning the rust.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a heat exchanger cleaning agent capable of cleaning rusty substances, which has the function of removing the rusty substances in the heat exchanger.
The invention has the following beneficial effects:
1. this can wash heat exchanger cleaner of rust matter through barium chloride, nitric acid solution, hydrochloric acid solution's use, gets rid of various incrustations earlier, increases the area of contact of hydrochloric acid and rust, has improved rust cleaning efficiency and effect, makes the abluent cleaner of heat exchanger.
2. According to the heat exchanger cleaning agent capable of cleaning the rusts, the saturated ferrous sulfate is mixed in the formula, after the cleaning agent is discharged after cleaning is completed, the residual saturated ferrous sulfate on the inner wall of the equipment and the hydrochloric acid solution are exposed in the air to react, and the residual hydrochloric acid solution is prevented from continuously corroding the inner wall of the equipment.
The invention adopts the following technical scheme for realizing the technical purpose: a heat exchanger cleaning agent capable of cleaning rusts comprises the following components:
4-10 parts of saturated ferrous sulfate;
1-4 parts of a synergist;
15-20 parts of a nitric acid solution;
30-40 parts of a hydrochloric acid solution;
15-20 parts of barium chloride;
50-80 parts of water;
3-5 parts of ethanol.
Preferably, the concentration of the nitric acid solution and the hydrochloric acid solution is 5-10%.
Preferably, the synergist is formed by mixing sodium fluoride and sodium sulfite in a ratio of 3: 5.
Preferably, the water is softened water.
Preferably, the ethanol concentration is 75%.
A heat exchanger cleaning agent blending method capable of cleaning rusty substances comprises the following steps:
s1, adding saturated ferrous sulfate, barium chloride, nitric acid solution and hydrochloric acid solution into a reaction kettle, and stirring at the speed of 60-90r/min for 10 min;
s2, adding the synergist, heating to 70-90 ℃, and stirring at the speed of 60-90r/min for 10 min;
s3, after the temperature is reduced to below 30 ℃, adding ethanol and water for 2-3 times, wherein the interval time is 1-2min each time, and stirring is carried out at the speed of 60-90r/min all the time in the process;
s4, standing the mixed solution for 10-15 h;
during the use process, the barium chloride, the nitric acid solution and the hydrochloric acid solution can react with scales (carbonate, sulfate and silicate) on the surface of the iron rust:
Na2CO3+2HNO3＝2NaNO3+H2O+CO2；
Na2SiO3+2HCl＝2NaCl+H2SiO3↓；
Na2SO4+BaCl2＝BaSO4+2NaCl；
scale is removed firstly, and rust removal is carried out, so that the cleaning effect is improved;
the ethanol organic solvent dissolves some grease and aromatic compounds;
and water may be used as a diluent;
the hydrochloric acid solution after reaction with the silicate reacts with bare leaking rust:
Fe2O3+6HCl＝＝2FeCl3+3H2O；
Fe+2HCl＝FeCl2+H2
when rust is basically removed and hydrochloric acid is in contact with iron in a large area to generate a large amount of bubbles, the cleaning agent is discharged, and the saturated ferrous sulfate and the hydrochloric acid solution which are remained on the inner wall of the equipment are exposed in the air to react:
12FeSO4+3O2+12HCl＝4Fe2(SO4)3+4FeCl3+6H2O
preventing the residual hydrochloric acid solution from continuously corroding the inner wall of the equipment.
Drawings
FIG. 1 is a schematic diagram of the rust removal rate of examples 1 to 4 of the present invention.
Detailed Description
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, and not all of the embodiments. 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.
Example 1
A heat exchanger cleaning agent capable of cleaning rusts comprises the following components: 4 parts of saturated ferrous sulfate; 1 part of a synergist; 15 parts of a nitric acid solution; 30 parts of a hydrochloric acid solution; 15 parts of barium chloride; 50 parts of water; and 3 parts of ethanol.
Preferably, the concentration of the nitric acid solution and the hydrochloric acid solution is 5%.
Preferably, the synergist is formed by mixing sodium fluoride and sodium sulfite in a ratio of 3: 5.
Preferably, the water is demineralized.
Preferably, the ethanol concentration is 75%.
A heat exchanger cleaning agent blending method capable of cleaning rusty substances comprises the following steps:
s1, adding saturated ferrous sulfate, barium chloride, nitric acid solution and hydrochloric acid solution into a reaction kettle, and stirring at the speed of 60/min for 10 min;
s2, adding the synergist, heating to 70 ℃, and stirring at the speed of 60r/min for 10 min;
s3, after the temperature is reduced to below 30 ℃, adding ethanol and water for 2 times, wherein the interval time is 1min each time, and stirring is carried out at the speed of 60r/min all the time in the process;
and S4, standing the mixed solution for 10 hours.
During the use process, the barium chloride, the nitric acid solution and the hydrochloric acid solution can react with scales (carbonate, sulfate and silicate) on the surface of the iron rust:
Na2CO3+2HNO3＝2NaNO3+H2O+CO2；
Na2SiO3+2HCl＝2NaCl+H2SiO3↓；
Na2SO4+BaCl2＝BaSO4+2NaCl；
scale is removed firstly, and rust removal is carried out, so that the cleaning effect is improved;
the ethanol organic solvent dissolves some grease and aromatic compounds;
and water may be used as a diluent;
the hydrochloric acid solution after reaction with the silicate reacts with bare leaking rust:
Fe2O3+6HCl＝＝2FeCl3+3H2O；
Fe+2HCl＝FeCl2+H2
when rust is basically removed and hydrochloric acid is in contact with iron in a large area to generate a large amount of bubbles, the cleaning agent is discharged, and the saturated ferrous sulfate and the hydrochloric acid solution which are remained on the inner wall of the equipment are exposed in the air to react:
12FeSO4+3O2+12HCl＝4Fe2(SO4)3+4FeCl3+6H2O
preventing the residual hydrochloric acid solution from continuously corroding the inner wall of the equipment.
The rust removal condition of the cleaning agent is as follows:
example 2
A heat exchanger cleaning agent capable of cleaning rusts comprises the following components: 5 parts of saturated ferrous sulfate; 2 parts of a synergist; 16 parts of a nitric acid solution; 35 parts of a hydrochloric acid solution; 16 parts of barium chloride; 60 parts of water; and 3 parts of ethanol.
Preferably, the concentration of the nitric acid solution and the hydrochloric acid solution is 7%.
Preferably, the synergist is formed by mixing sodium fluoride and sodium sulfite in a ratio of 3: 5.
Preferably, the water is demineralized.
Preferably, the ethanol concentration is 75%.
A heat exchanger cleaning agent blending method capable of cleaning rusty substances comprises the following steps:
s1, adding saturated ferrous sulfate, barium chloride, nitric acid solution and hydrochloric acid solution into a reaction kettle, and stirring at the speed of 70r/min for 10 min;
s2, adding the synergist, heating to 80 ℃, and stirring at the speed of 70r/min for 10 min;
s3, after the temperature is reduced to below 30 ℃, adding ethanol and water for 2 times, wherein the interval time is 1min each time, and stirring is carried out at the speed of 70r/min all the time in the process;
and S4, standing the mixed solution for 13 h.
During the use process, the barium chloride, the nitric acid solution and the hydrochloric acid solution can react with scales (carbonate, sulfate and silicate) on the surface of the iron rust:
Na2CO3+2HNO3＝2NaNO3+H2O+CO2；
Na2SiO3+2HCl＝2NaCl+H2SiO3↓；
Na2SO4+BaCl2＝BaSO4+2NaCl；
scale is removed firstly, and rust removal is carried out, so that the cleaning effect is improved;
the ethanol organic solvent dissolves some grease and aromatic compounds;
and water may be used as a diluent;
the hydrochloric acid solution after reaction with the silicate reacts with bare leaking rust:
Fe2O3+6HCl＝＝2FeCl3+3H2O；
Fe+2HCl＝FeCl2+H2
when rust is basically removed and hydrochloric acid is in contact with iron in a large area to generate a large amount of bubbles, the cleaning agent is discharged, and the saturated ferrous sulfate and the hydrochloric acid solution which are remained on the inner wall of the equipment are exposed in the air to react:
12FeSO4+3O2+12HCl＝4Fe2(SO4)3+4FeCl3+6H2O
preventing the residual hydrochloric acid solution from continuously corroding the inner wall of the equipment.
The rust removal condition of the cleaning agent is as follows:
| time (min) | Rust removal Rate (%) |
| 10 | 4 |
| 20 | 12 |
| 30 | 30 |
| 40 | 55 |
| 50 | 70 |
| 60 | 85 |
Example 3
A heat exchanger cleaning agent capable of cleaning rusts comprises the following components: 4-10 parts of saturated ferrous sulfate; 1-4 parts of a synergist; 20 parts of a nitric acid solution; 35 parts of a hydrochloric acid solution; 20 parts of barium chloride; 70 parts of water; and 5 parts of ethanol.
Preferably, the concentration of the nitric acid solution and the hydrochloric acid solution is 10%.
Preferably, the synergist is formed by mixing sodium fluoride and sodium sulfite in a ratio of 3: 5.
Preferably, the water is demineralized.
Preferably, the ethanol concentration is 75%.
A heat exchanger cleaning agent blending method capable of cleaning rusty substances comprises the following steps:
s1, adding saturated ferrous sulfate, barium chloride, nitric acid solution and hydrochloric acid solution into a reaction kettle, and stirring at the speed of 60-90r/min for 10 min;
s2, adding the synergist, heating to 90 ℃, and stirring at the speed of 90r/min for 10 min;
s3, after the temperature is reduced to below 30 ℃, adding ethanol and water for 3 times, wherein the interval time is 2min each time, and stirring is carried out at the speed of 90r/min all the time in the process;
s4, standing the mixed solution for 15 hours;
during the use process, the barium chloride, the nitric acid solution and the hydrochloric acid solution can react with scales (carbonate, sulfate and silicate) on the surface of the iron rust:
Na2CO3+2HNO3＝2NaNO3+H2O+CO2；
Na2SiO3+2HCl＝2NaCl+H2SiO3↓；
Na2SO4+BaCl2＝BaSO4+2NaCl；
scale is removed firstly, and rust removal is carried out, so that the cleaning effect is improved;
the ethanol organic solvent dissolves some grease and aromatic compounds;
and water may be used as a diluent;
the hydrochloric acid solution after reaction with the silicate reacts with bare leaking rust:
Fe2O3+6HCl＝＝2FeCl3+3H2O；
Fe+2HCl＝FeCl2+H2
when rust is basically removed and hydrochloric acid is in contact with iron in a large area to generate a large amount of bubbles, the cleaning agent is discharged, and the saturated ferrous sulfate and the hydrochloric acid solution which are remained on the inner wall of the equipment are exposed in the air to react:
12FeSO4+3O2+12HCl＝4Fe2(SO4)3+4FeCl3+6H2O
preventing the residual hydrochloric acid solution from continuously corroding the inner wall of the equipment.
The rust removal condition of the cleaning agent is as follows:
| time (min) | Rust removal Rate (%) |
| 10 | 10 |
| 20 | 30 |
| 30 | 50 |
| 40 | 70 |
| 50 | 80 |
| 60 | 90 |
Example 4
A heat exchanger cleaning agent capable of cleaning rusts comprises the following components: 10 parts of saturated ferrous sulfate; 4 parts of a synergist; 20 parts of a nitric acid solution; 40 parts of hydrochloric acid solution; 20 parts of barium chloride; 80 parts of water; and 5 parts of ethanol.
Preferably, the concentration of the nitric acid solution and the hydrochloric acid solution is 10%.
Preferably, the synergist is formed by mixing sodium fluoride and sodium sulfite in a ratio of 3: 5.
Preferably, the water is demineralized.
Preferably, the ethanol concentration is 75%.
A heat exchanger cleaning agent blending method capable of cleaning rusty substances comprises the following steps:
s1, adding saturated ferrous sulfate, barium chloride, nitric acid solution and hydrochloric acid solution into a reaction kettle, and stirring at the speed of 90r/min for 10 min;
s2, adding the synergist, heating to 90 ℃, and stirring at the speed of 90r/min for 10 min;
s3, after the temperature is reduced to below 30 ℃, adding ethanol and water for 3 times, wherein the interval time is 2min each time, and stirring is carried out at the speed of 90r/min all the time in the process;
s4, standing the mixed solution for 15 hours;
during the use process, the barium chloride, the nitric acid solution and the hydrochloric acid solution can react with scales (carbonate, sulfate and silicate) on the surface of the iron rust:
Na2CO3+2HNO3＝2NaNO3+H2O+CO2；
Na2SiO3+2HCl＝2NaCl+H2SiO3↓；
Na2SO4+BaCl2＝BaSO4+2NaCl；
scale is removed firstly, and rust removal is carried out, so that the cleaning effect is improved;
the ethanol organic solvent dissolves some grease and aromatic compounds;
and water may be used as a diluent;
the hydrochloric acid solution after reaction with the silicate reacts with bare leaking rust:
Fe2O3+6HCl＝＝2FeCl3+3H2O；
Fe+2HCl＝FeCl2+H2
when rust is basically removed and hydrochloric acid is in contact with iron in a large area to generate a large amount of bubbles, the cleaning agent is discharged, and the saturated ferrous sulfate and the hydrochloric acid solution which are remained on the inner wall of the equipment are exposed in the air to react:
12FeSO4+3O2+12HCl＝4Fe2(SO4)3+4FeCl3+6H2O
preventing the residual hydrochloric acid solution from continuously corroding the inner wall of the equipment.
The rust removal condition of the cleaning agent is as follows:
| time (min) | Rust removal Rate (%) |
| 10 | 10 |
| 20 | 35 |
| 30 | 55 |
| 40 | 75 |
| 50 | 90 |
| 60 | 95 |
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A heat exchanger cleaning agent capable of cleaning rusty materials is characterized in that: the components comprise:
1-4 parts of a synergist;
4-10 parts of saturated ferrous sulfate;
15-20 parts of a nitric acid solution;
30-40 parts of a hydrochloric acid solution;
15-20 parts of barium chloride;
50-80 parts of water;
3-5 parts of ethanol.
2. The cleaning agent for heat exchanger capable of cleaning rust according to claim 1, wherein: the concentration of the nitric acid solution and the hydrochloric acid solution is 5-10%.
3. The cleaning agent for heat exchanger capable of cleaning rust according to claim 1, wherein: the synergist is prepared by mixing 3:5 parts of sodium fluoride and sodium sulfite.
4. The cleaning agent for heat exchanger capable of cleaning rust according to claim 1, wherein: the water is softened water.
5. The cleaning agent for heat exchanger capable of cleaning rust according to claim 1, wherein: the ethanol concentration is 75%.
6. The method for preparing a cleaning agent for a heat exchanger, according to claim 1, wherein the cleaning agent for a heat exchanger comprises: the method comprises the following steps:
s1, adding saturated ferrous sulfate, barium chloride, nitric acid solution and hydrochloric acid solution into a reaction kettle, and stirring at the speed of 60-90r/min for 10 min;
s2, adding the synergist, heating to 70-90 ℃, and stirring at the speed of 60-90r/min for 10 min;
s3, after the temperature is reduced to below 30 ℃, adding ethanol and water for 2-3 times, wherein the interval time is 1-2min each time, and stirring is carried out at the speed of 60-90r/min all the time in the process;
s4, standing the mixed solution for 10-15 h.
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| CN102373478A (en) * | 2010-08-20 | 2012-03-14 | 3M创新有限公司 | Rust removal composition |
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