CN104233329B - Chemical cleaning method of heat exchanger - Google Patents
Chemical cleaning method of heat exchanger Download PDFInfo
- Publication number
- CN104233329B CN104233329B CN201410468065.9A CN201410468065A CN104233329B CN 104233329 B CN104233329 B CN 104233329B CN 201410468065 A CN201410468065 A CN 201410468065A CN 104233329 B CN104233329 B CN 104233329B
- Authority
- CN
- China
- Prior art keywords
- acid
- heat exchanger
- cleaning
- cleaning method
- benzyl ammonium
- 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
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a chemical cleaning method of a heat exchanger, which is short in cleaning time and low in corrosive property. The chemical cleaning method comprises the following steps: (1) configuring a pipe for the heat exchanger in the shutdown state of a cooling system, and connecting a liquid preparation tank and a cleaning pump to the outside of the configured pipe to form a closed system for pump circulation cleaning; (2) adding soaking liquid obtained by mixing a dispersion chelating agent with a stripping agent into the closed system in the step (1), and soaking the heat exchanger for 1 hour; (3) selecting corresponding acid and corrosion inhibitor according to the material of the heat exchanger, adding the acid and the corrosion inhibitor into the soaking liquid of the closed system in the step (1) to form cleaning liquid, performing pump circulation acid-washing for 2-3 hours, and properly prolonging or shortening the acid-washing time according to the scale formation thickness; and (4) adjusting the pH value of the cleaning liquid in the step (3) to be about 7 by using sodium hydroxide, discharging, and flushing to finish the cleaning process.
Description
Technical field
The present invention relates to a kind of heat exchanger cleaning method, especially a kind of heat exchanger chemical cleaning method.
Background technology
The industries such as oil, chemical industry, electric power, metallurgy, pharmacy, printing and dyeing have circulating cooling system, and cooling water is in blood circulation
In constantly recycle, due to water temperature rising and evaporation of water concentrate, the attachment of deposit can be produced, especially in heat exchanger
On heating surface, the various salts dissolved in natural water, such as heavy carbonate, sulfate, chloride, silicate is easily reached
Saturation and from water crystallization separate out, be firmly attached on heat exchange surface.This not only substantially reduces heat transfer efficiency, can also be because
Fouling produces underdeposit corrosion, microbial growth, ultimately results in wall erosion perforation and leaks.Scale inhibition is added in cooling water system
Agent can avoid the generation of these phenomenons, yet with dosing deficiency or blowdown not in time, the knot that heat transmission equipment can also be different degrees of
Dirt and corrosion, need periodically to be cleaned.It is at present to adopt the method for shutting down direct pickling and do not shut down on-line cleaning method more.Pass
The stop cleaning acid washing method of system, the method for directly adding corrosion inhibiter using strong acid, hard scale is difficult to remove, and scavenging period is long, typically
It is serious to equipment matrix corrosion for more than 10 hours.On-line cleaning method is not shut down, it is little to equipment corrosion, but the cleaning frequency
It is longer, generally 20 days or so.For the system that heat exchange efficiency has high demands, it is desirable to be able to which quick descaling will to meet operating mode heat exchange
Ask；The system serious for fouling, the cleaning frequency that on-line cleaning needs is also longer, and in the case of these, quick low corrosion stops
Cleaning is more advantageous.
The content of the invention
The invention provides the heat exchanger chemical cleaning method that a kind of scavenging period is short, corrosivity are little.
The heat exchanger chemical cleaning method of the object of the invention is realized, is comprised the steps：
(1) under cooling system stopped status, heat exchanger carries out pipe arrangement, in the external liquid pool of pipe arrangement and cleaning pump, shape
Into closed system, realize that pump circulation is cleaned；
(2) soak that dispersion chelating agen and remover mix is added in the closed system of step (1), immersion heat exchange
Device, soak time is 1 hour；
(3) according to the material of heat exchanger, corresponding acid and corrosion inhibiter is selected to be added to the immersion of the closed system of step (1)
Cleanout fluid is formed in liquid, pump circulation pickling is carried out, and pickling time is suitably increased and decreased according to the thin and thick situation of fouling, pickling time is
2～3 hours；
(4) it is 7 or so the cleanout fluid sodium hydroxide of step (3) to be adjusted into pH, and discharge is rinsed, and cleaning is completed.
It is described dispersion chelating agen be：Maleic acid-acrylic acid copolymer, acrylic acid-acrylic acid hydroxypropyl acrylate, polyacrylic acid and
One or two in the tricarboxylic acids of 2- phosphinylidyne butanes 1,2,4-, the concentration of the dispersion chelating agen is 100mg/L～150mg/
L。
The remover is：Dodecyl dimethyl benzyl ammonium chloride aqueous solution, tetradecyl chloride base dimethyl benzyl ammonium,
Octadecyl dimethyl benzyl ammonium chloride, dodecyl dimethyl benzyl ammonium bromide and hexadecyldimethyl benzyl ammonium (2- sulfurous acids) second
One or two in base ammonium, the concentration of the remover is 100mg/L～150mg/L.
The acid is：Hydrochloric acid, sulphuric acid, the one kind in sulfamic acid, the concentration of the acid is 8wt%～10wt%.
The corrosion inhibiter is：Hexamethylenetetramine and thiourea, the concentration of the corrosion inhibiter is 0.3wt%.
The heat exchanger chemical cleaning method of the present invention has the beneficial effect that：
The heat exchanger chemical cleaning method of the present invention, chemical drugss are simple and easy to get, prepare easy to use, cleaning process operation
Simply, scavenging period is short, and corrosivity are little, and heat exchanger surface corrosion and scaling deposit removal efficiency is high, while also have suppressing acid
The effect of mist, improves pickling work condition environment.
Specific embodiment
Embodiment 1：
The cleaning of cooling water simple steel heat exchanger, dirty 1.5～2.0mm of layer, the average dirt amount of sample pipe is 1857.4g/m2。
The soaking agent for adopting for：Maleic acid-acrylic acid copolymer solution and dodecyl dimethyl benzyl ammonium chloride are water-soluble
Liquid.The acid for adopting for：Hydrochloric acid.Corrosion inhibiter is：Hexamethylenetetramine and thiourea.Cleaning temperature：22.5～27.2 DEG C, immersion 1 is little
When, scavenging period：2 hours.As newly, washability is more than 90% to carbon steel surface-brightening, rate of corrosion 1.56g/m after cleaning2H,
Far smaller than GB rate of corrosion index 5g/m2h。
Embodiment 2：
Cooling water stainless heat exchanger is cleaned, dirty 1.0～1.1mm of layer, and the average dirt amount of sample pipe is 1128.3g/m2。
The soaking agent for adopting for：Hydroxy ethylene diphosphonic acid, hexadecyldimethyl benzyl ammonium (2- sulfurous acids) ethyl ammonium.Using
Acid is：Sulfamic acid.Corrosion inhibiter is hexamethylenetetramine, thiourea.Cleaning temperature：24.9～29.7 DEG C, soak 1 hour, cleaning
Time：3 hours.Stainless steel surfaces light is as newly after cleaning, and scale removal is clean, and washability is more than 95%, corrosion rate
0.26g/m2H, far smaller than GB rate of corrosion index 1.5g/m2h。
| Using medicament | Concentration |
| Hydroxy ethylene diphosphonic acid | 100mg/L |
| Hexadecyldimethyl benzyl ammonium (2- sulfurous acids) ethyl ammonium | 100mg/L |
| Sulfamic acid | 8wt% |
| Hexamethylenetetramine | 0.3wt% |
| Thiourea | 0.3wt% |
Embodiment 3：
Cooling water pyrite heat exchanger is cleaned, dirty 0.5～0.6mm of layer, and the average dirt amount of sample pipe is 489.4g/m2。
The soaking agent for adopting for：Acrylic acid-acrylic acid hydroxypropyl acrylate and dodecyl dimethyl benzyl ammonium chloride aqueous solution.Adopt
Acid is：Sulphuric acid.Corrosion inhibiter is hexamethylenetetramine, thiourea.Cleaning temperature：20.1～25.4 DEG C, soak 1 hour, cleaning
Time：2.5 hour.As newly, washability is more than 90% to brass surfaces light, corrosion rate 0.37g/m after cleaning2H, much
Less than GB rate of corrosion index 1.5g/m2h。
Embodiment 4：
Cooling water aluminium heater is cleaned, dirty 0.6～0.7mm of layer, and the average dirt amount of sample pipe is 519.1g/m2。
The soaking agent for adopting for：Acrylic acid-acrylic acid hydroxypropyl acrylate and dodecyl dimethyl benzyl ammonium chloride aqueous solution.Adopt
Acid is：Sulphuric acid, corrosion inhibiter is hexamethylenetetramine, thiourea.Cleaning temperature：24.5～28.1 DEG C, soak 1 hour, cleaning
Time：2 hours.As newly, washability is more than 95% to aluminium surface light, corrosion rate 0.49g/m after cleaning2H, far smaller than
GB rate of corrosion index 1.5g/m2h。
| Using medicament | Concentration |
| Acrylic acid-acrylic acid hydroxypropyl acrylate | 100mg/L |
| Dodecyl dimethyl benzyl ammonium chloride | 100mg/L |
| Sulphuric acid | 8wt% |
| Hexamethylenetetramine | 0.3wt% |
| Thiourea | 0.3wt% |
Embodiment 5：
Cooling water stainless heat exchanger is cleaned, dirty 0.8～0.9mm of layer, and the average dirt amount of sample pipe is 716.3g/m2。
The soaking agent for adopting for：Acrylic acid-acrylic acid hydroxypropyl acrylate, hexadecyldimethyl benzyl ammonium (2- sulfurous acids) ethyl ammonium.Adopt
Acid is：Sulfamic acid.Corrosion inhibiter is hexamethylenetetramine, thiourea.Cleaning temperature：23.4～26.4 DEG C, soak 1 hour,
Scavenging period：2.5 hour.As newly, washability is more than 90% to stainless steel surfaces light, and scale removal is clean after cleaning, corrosion speed
Rate 0.32g/m2H, far smaller than GB rate of corrosion index 1.5g/m2h。
| Using medicament | Concentration |
| Acrylic acid-acrylic acid hydroxypropyl acrylate | 150mg/L |
| Hexadecyldimethyl benzyl ammonium (2- sulfurous acids) ethyl ammonium | 150mg/L |
| Sulfamic acid | 9wt% |
| Hexamethylenetetramine | 0.3wt% |
| Thiourea | 0.3wt% |
Embodiment 6：
Cooling water red copper heat exchanger is cleaned, dirty 0.4～0.5mm of layer, and the average dirt amount of sample pipe is 491.2g/m2。
The soaking agent for adopting for：Maleic acid-acrylic acid copolymer solution and dodecyl dimethyl benzyl ammonium chloride are water-soluble
Liquid.The acid for adopting for：Hydrochloric acid.Corrosion inhibiter is hexamethylenetetramine, thiourea.Cleaning temperature：22.1～26.7 DEG C, soak 1 hour,
Scavenging period：2 hours.As newly, washability is more than 95% to copper surface-brightening, corrosion rate 0.27g/m after cleaning2H, much
Less than GB rate of corrosion index 1.5g/m2h。
| Using medicament | Concentration |
| Maleic acid-acrylic acid copolymer | 120mg/L |
| Dodecyl dimethyl benzyl ammonium chloride | 120mg/L |
| Hydrochloric acid | 10wt% |
| Hexamethylenetetramine | 0.3wt% |
| Thiourea | 0.3wt% |
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, under the premise of without departing from design spirit of the present invention, this area ordinary skill technical staff is to the technology of the present invention side
Various modifications and improvement that case is made, all should fall in the protection domain of claims of the present invention determination.
Claims (4)
1. a kind of heat exchanger chemical cleaning method, comprises the steps：
（1）Under cooling system stopped status, heat exchanger carries out pipe arrangement, in the external liquid pool of pipe arrangement and cleaning pump, forms envelope
System is closed, realizes that pump circulation is cleaned；
（2）The soak that dispersion chelating agen and remover mix is added to step（1）Closed system in, soak heat exchanger,
Soak time is 1 hour；
（3）According to the material of heat exchanger, corresponding acid and corrosion inhibiter is selected to be added to step（1）Closed system soak in
Cleanout fluid is formed, pump circulation pickling is carried out, and pickling time is suitably increased and decreased according to the thin and thick situation of fouling, pickling time is 2～3
Hour；
（4）By step（3）Cleanout fluid sodium hydroxide to adjust pH be 7, discharge is rinsed, and cleaning completes；
It is described dispersion chelating agen be：Maleic acid-acrylic acid copolymer, acrylic acid-acrylic acid hydroxypropyl acrylate, polyacrylic acid and 2- phosphines
One or two in the tricarboxylic acids of acyl group butane 1,2,4-, the concentration of the dispersion chelating agen is 100mg/L～150mg/L.
2. heat exchanger chemical cleaning method according to claim 1, it is characterised in that：The remover is：Chlorination 12
Alkyl dimethyl benzyl ammonium aqueous solution, tetradecyl chloride base dimethyl benzyl ammonium, octadecyl dimethyl benzyl ammonium chloride, bromination
Dodecyl dimethyl hexadecyldimethyl benzyl ammonium and hexadecyldimethyl benzyl ammonium（2- sulfurous acids）One or two in ethyl ammonium, the stripping
The concentration of agent is 100mg/L～150mg/L.
3. heat exchanger chemical cleaning method according to claim 1, it is characterised in that：The acid is：Hydrochloric acid, sulphuric acid, ammonia
One kind in base sulfonic acid, the concentration of the acid is 8wt%～10wt%.
4. according to the arbitrary described heat exchanger chemical cleaning method of claims 1 to 3, it is characterised in that：The corrosion inhibiter is：Six
Methine tetramine and thiourea, the concentration of the corrosion inhibiter is 0.3wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410468065.9A CN104233329B (en) | 2014-09-15 | 2014-09-15 | Chemical cleaning method of heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410468065.9A CN104233329B (en) | 2014-09-15 | 2014-09-15 | Chemical cleaning method of heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104233329A CN104233329A (en) | 2014-12-24 |
| CN104233329B true CN104233329B (en) | 2017-04-12 |
Family
ID=52222202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410468065.9A Active CN104233329B (en) | 2014-09-15 | 2014-09-15 | Chemical cleaning method of heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104233329B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949571B (en) * | 2015-06-17 | 2018-06-26 | 彭伟 | Zero-emission online accurate chemical cleaning method and device for tube heat exchanger |
| CN104962933A (en) * | 2015-07-29 | 2015-10-07 | 福建福晶科技股份有限公司 | Cleaning method of induction coil |
| CN105821424A (en) * | 2016-05-30 | 2016-08-03 | 江阴市亚龙换热设备有限公司 | Cleaning method of stainless steel plate heat exchanger |
| CN106989633B (en) * | 2017-05-25 | 2021-06-01 | 天脊煤化工集团股份有限公司 | Cleaning method of heat exchanger for crude gas heat exchange |
| CN108080333A (en) * | 2018-01-08 | 2018-05-29 | 长沙理工大学 | A kind of valve cooling system screening electrodes on-line cleaning method |
| CN110512216B (en) * | 2019-08-30 | 2021-09-24 | 四川达兴能源股份有限公司 | Liquid medicine for online cleaning of coke dry quenching condenser, preparation method and online cleaning method |
| CN110595260B (en) * | 2019-10-08 | 2021-03-23 | 广东石油化工学院 | On-line cleaning method for dirt of shell-and-tube heat exchanger |
| CN111322904B (en) * | 2019-12-30 | 2021-12-31 | 甘肃银光化学工业集团有限公司 | Optimization method for heat exchanger pickling process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101565660A (en) * | 2009-06-02 | 2009-10-28 | 董宇新 | Organic descaling composition, preparation method and application thereof |
| CN101892489A (en) * | 2010-07-23 | 2010-11-24 | 广州唯普电力科技有限公司 | Cleaning agent for flue dust scale on surface of gas heat exchanger of gas desulfurization system and preparation method thereof |
| CN103409763A (en) * | 2013-08-16 | 2013-11-27 | 深圳市爱康泉水处理服务有限公司 | Composition for cleanser, cleanser and application thereof |
| CN103469222A (en) * | 2013-09-26 | 2013-12-25 | 宁夏启元国药有限公司 | Descaling agent for water scale of condensing equipment and descaling method |
| CN103981529A (en) * | 2014-05-21 | 2014-08-13 | 河南省科学院能源研究所有限公司 | Stainless steel equipment cleaning agent, cleaning solution and cleaning method |
-
2014
- 2014-09-15 CN CN201410468065.9A patent/CN104233329B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101565660A (en) * | 2009-06-02 | 2009-10-28 | 董宇新 | Organic descaling composition, preparation method and application thereof |
| CN101892489A (en) * | 2010-07-23 | 2010-11-24 | 广州唯普电力科技有限公司 | Cleaning agent for flue dust scale on surface of gas heat exchanger of gas desulfurization system and preparation method thereof |
| CN103409763A (en) * | 2013-08-16 | 2013-11-27 | 深圳市爱康泉水处理服务有限公司 | Composition for cleanser, cleanser and application thereof |
| CN103469222A (en) * | 2013-09-26 | 2013-12-25 | 宁夏启元国药有限公司 | Descaling agent for water scale of condensing equipment and descaling method |
| CN103981529A (en) * | 2014-05-21 | 2014-08-13 | 河南省科学院能源研究所有限公司 | Stainless steel equipment cleaning agent, cleaning solution and cleaning method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104233329A (en) | 2014-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104233329B (en) | Chemical cleaning method of heat exchanger | |
| CN101608882B (en) | Method for cleaning copper tubes of condenser | |
| CN103510097B (en) | Condenser low corrosion high cleanliness chemical cleaning method | |
| ES2943022T3 (en) | Scale removal method for steam generation installations | |
| CN101955863B (en) | Neutral calcium sulfate scale cleaning agent | |
| CN106032966A (en) | Method for cleaning heat exchangers | |
| CN106521519A (en) | Cleaning agent for oxide skin of overheater and cleaning method thereof | |
| CN110818099A (en) | Water circulation dirt treating agent | |
| TW201447184A (en) | Method of removing scale for steam generation equipment | |
| CN102392262A (en) | Rust remover | |
| CN104876384A (en) | Zero-emission treatment system and method for industrial circulating water | |
| CN102534641A (en) | Organic acid cleaning agent and manufacture method thereof | |
| CN104030479A (en) | Treatment method for air conditioner circulating water | |
| CN108680054B (en) | Cleaning method and device for movable VACOM (vapor-assisted-COM) pre-heat exchanger | |
| WO2021082305A1 (en) | Circulating cooling water treatment device and circulating cooling water treatment method | |
| JP5891630B2 (en) | Boiler water scale removal method | |
| JP6314560B2 (en) | Water treatment method for steam generating equipment | |
| CN103834956A (en) | Cleaning agent household heating system consisting of various metal materials and preparation method for cleaning agent | |
| JP5085962B2 (en) | Silica-based antifouling agent and silica-based antifouling method | |
| CN202849169U (en) | Special descaling, corrosion-inhibiting and sterilizing equipment | |
| CN104962933A (en) | Cleaning method of induction coil | |
| TWI593829B (en) | Cleaning composition for water circulation system and method of cleaning surface using the same | |
| CN105316689B (en) | Chemical cleaning agent for natural gas water jacket heating furnace and cleaning method | |
| RU2349856C1 (en) | Method of pipeline chemical descaling | |
| JP5019609B2 (en) | Metal corrosion inhibitor and corrosion inhibition method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |