CN102586772A - Passivation process after chemical cleaning of boiler - Google Patents
Passivation process after chemical cleaning of boiler Download PDFInfo
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- CN102586772A CN102586772A CN2012100430119A CN201210043011A CN102586772A CN 102586772 A CN102586772 A CN 102586772A CN 2012100430119 A CN2012100430119 A CN 2012100430119A CN 201210043011 A CN201210043011 A CN 201210043011A CN 102586772 A CN102586772 A CN 102586772A
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- boiler
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- matting
- hydrazine
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to a passivation process after chemical cleaning of a high-temperature high-pressure station boiler. The process comprises preparing a passivation solution, and adding the passivation solution after the cleaning of the boiler is passed, and circulating at 15-35 DEG C for 8-12 hours, wherein the passivation solution comprises methanol, sodium hydrogen sulfate, hydrazine, trialkyl ammonium chloride, ammonia and water, the contents of the above components in per liter of the passivation solution are as follows: 120-160mg/L of methanol, 700-800mg/L of sodium bisulfate, 700-800mg/L of hydrazine, 120-160mg/L of trialkyl ammonium chloride, proper amount of ammonia enough for adjusting the pH of the passivation solution to 8-12, and the balance of water. The passivation process provided by the invention enables a uniform and dense protective layer to grow on the inner surface of the heating side of the boiler so as to keep the boiler against acid, alkali and oxygen corrosion at a normal temperature, the phenomenon of secondary rusting caused by that the boiler cannot be adapted to be laid aside for a long time after acid cleaning is avoided, and the protection time is long.
Description
Technical field
The invention belongs to the chemical cleaning technique field of industrial equipments, be specifically related to the passivation technology after the high temperature high pressure electric power station boiler matting.
Background technology
In the boiler matting, the passivation stage is last link, also is a very important link.No matter adopting mineral acid still is that organic acid carries out the boiler matting, when removing various dirt type and corrosion product, also makes the metallic surface be converted into active state, very easily produces corrosion, makes the boiler internal surface produce that secondary is floating to become rusty and situation such as spot corrosion.Boiler matting post-passivation is done badly occurs very easily also that stove water iron-holder continues to exceed standard and phosphoric acid salt such as hides at unusual phenomenon.This shows that in the work of boiler matting, the passivation stage is a very important link, improper if passivation technology is selected, with the effect of the whole cleaning of influence, even cause the failure of cleaning.The passivation poor quality will directly influence the water and steam quality after the startup in the boiler cleaning; Unusual phenomenoies such as, phosphoric acid salt higher like stove water iron level is hiding all possibly take place; Thereby cause the burn into fouling and the salification of boiler heating power system, bring many problems to follow-up work.
In May, 2011; The rather flat thermoelectric power station 130T/H of the coal head fertilizer plant boiler of Vietnam is nervous because of the duration; Vietnam owner is to the passivation procedure insufficient recognition of boiler in addition, after matting finishes, omitted passivation procedure and directly starts boiler, and stove water iron ion was still up to 400 μ g/L (normally being 20～30 μ g/L) after the result had started 20 days; Long-term underproof stove water water quality has not only prolonged the start time of unit; The normal operation of harm turbine, even more serious is to cause boiler tube to cause underdeposit corrosion because of rust deposite, causes the boiler tube booster and influences the safety and economic operation of boiler.
The domestic station boiler recoverable amount of China is amounted to steam output about 1.8 * 10 at present
6T/H, and increase with annual 10% speed.Regulation according to " heat power plant boiler matting guide rule "; Newly-built high temperature high pressure electric power station boiler must carry out matting before operation; And average cleanings of operation boiler year is limited to 5～10 years, and according to this regulation, every year, steam output about 5 * 10 was amounted in the needs cleaning
5The high temperature high pressure electric power station boiler of T/H; Huge flushing dose like this; If can not carry out effective passivation protection after the pickling, the metallic matrix of Showed Very Brisk will make boiler generate the floating rust of secondary very soon, not only influence boiler work-ing life; Also prolonged the start time of boiler greatly, this loss that causes to electric power enterprise will be very huge.In " heat power plant boiler matting guide rule "; Strict regulation has also been carried out in passivation measure after the pickling; Passivation technology has also been recommended nearly 10 kinds; But the difficult people's will to the greatest extent of the protection effect of these passivation technologies, it is very few to satisfy in 20 days rustless technology, let alone the boiler that makes the construction period prolongation because of a variety of causes has effectively been protected.
Summary of the invention
For solving the passivation protection time limit weak point that exists in the prior art, the technical problem of weak effect, the present invention proposes the passivation novel process behind a kind of boiler acid pickling.
Technical scheme of the present invention is: the passivation technology after a kind of boiler matting may further comprise the steps:
(1) preparation passivating solution: passivating solution comprises component: methyl alcohol, sodium pyrosulfate, hydrazine, tri alkyl ammomium chloride, ammoniacal liquor and water, and the content of each component in every liter of passivating solution is: methyl alcohol 120～160mg/L, preferred 150mg/L; Sodium pyrosulfate 700～800mg/L, preferred 750mg/L, hydrazine 700～800mg/L; Preferred 750mg/L, tri alkyl ammomium chloride 120～160mg/L, preferred 150mg/L; The consumption of ammoniacal liquor is as the criterion water surplus with pH value to 8～12 of regulating passivating solution;
(2) boiler is carried out passivation: the boiler after qualified through matting adds the passivating solution that makes in the step (1), under 15～35 ℃ of conditions, circulates 8～12 hours.Passivation finishes and bleeds off passivating solution and get final product.
After passivation finishes; Passivating solution produces the protective membrane of one deck even compact at the metal base surface of boiler; Although thickness only have tens
can effectively resist corrosive medium erosion and can secluding air, the shelf time after the boiler matting is prolonged greatly.
Passivation technology after the said boiler matting also comprised matting and rinse step before passivation:
1, matting: comprise alkali cleaning and pickling.
For newly constructed boiler, for newly constructed boiler, it is being made, can form high temperature oxidation in the course of processing and roll skin and band silicon oxidation skin, and is depositing, can produce corrosion product, welding slag and the silt of bringing into, grease coating, pollutent etc. in the transportation, installation process; For the operation boiler, because operation for a long time, its heating surface internal surface inevitably can generate one deck incrustation scale, influences the safety and economic operation of boiler.According to the regulation of " heat power plant boiler matting guide rule ", the boiler of both of these case all will carry out matting, and matting is divided into alkali cleaning oil removing and two steps of acid pickling and rust removing.
2, rinsing: after the matting boiler is carried out rinsing.The rinsing medicament is selected 0.2%～0.4% citric acid solution for use.
After the matting, the metallic matrix Showed Very Brisk therefore in the water rinse stage, is easy to generate the floating rust of secondary, in order to prevent the generation of the floating rust of secondary, for passivation creates conditions, after matting, should carry out rinsing.
Rather flat 4*220t/H boiler cleans this passivation technology of use in the engineering in the cleaning of Ganzhou biological power plant 130t/H boiler, Vietnam, has all obtained the excellent protection effect.
Beneficial effect of the present invention is: passivation technology provided by the invention; Make even, the compact protective film of boiler surface internal surface generation one deck; Under the normal temperature state; Can prevent the erosion of acid, alkali, oxygen, overcome boiler and can not adapt to after because of pickling and shelve the phenomenon that generates the floating rust of secondary for a long time, and guard time reach more than half a year.
Description of drawings
Fig. 1 is the structural representation of Chemical Cleaning and Passivation of Boiler system among the present invention.
Wherein: 1, drum, 2, front water wall next part case, 3, rear water wall next part case, 4, right-side wall water wall next part case; 5, left side wall water wall next part case, 6, economizer, 7, cleaning case, 8, scavenging pump; 9, scavenging pump access doors, 10, the scavenging pump outlet portal, 11, scavenger circuit I access doors, 12, scavenger circuit I outlet portal; 13, scavenger circuit II access doors, 14, the scavenger circuit recirculation door, 15, the monitor tube access doors, 16, the monitor tube outlet portal; 17, dense medicine-chest, 18, dense Teat pipette, 19, system's sewage door; G, rate of flow meter, T, thermometer, U, sampling spot, P, tensimeter, Y, corrosion written instructions sheet installation place.
Embodiment
Specify the present invention below in conjunction with accompanying drawing and embodiment.
Embodiment 1:
Matting and passivation with Ganzhou biological power plant 130t/H boiler are example, and its operation steps is following:
1, water flushing
As Fig. 1 with the equipment of Chemical Cleaning and Passivation of Boiler system connect finish after, in system, fill with the circulation of clear water turn on pump, keep more than the system pressure 0.8MPa, check system has or not leakage, finds to leak in time and gets rid of, and continue the limpid back of circulation flushing to water outlet and discharge.
2, matting
(1) alkali cleaning
The purpose of alkali cleaning is the greasy dirt in the system of removing, with alkaline cleaner (like NaOH, Na
3PO
4Deng) add into system, be steam heated to 85～95 ℃ of temperature, wash cycles 8～12 hours.
(2) pickling
The purpose of pickling is incrustation scale, red stone dirt in the system of removing etc., and acidic cleaner (like HCl) and inhibiter are added into system, and wash cycles is 6～8 hours under 15～35 ℃ of temperature.
(3) water flushing
After the matting, can a residual part clean waste liquid in the system, and the deposition dirt that washes down; In order to make passivation reach best effect; Must after matting, carry out water flushing completely, flushing can utilize the Cleaning and Passivation recycle system, and the interior priority of the past interim recycle system injects fire water and de-mineralized water washes; Until outlet ∑ Fe＜50mg/L, pH value >=4.
3, rinsing
Therefore after the matting, the metallic matrix Showed Very Brisk is in the water rinse stage of matting; Be easy to generate the floating rust of secondary, in order to prevent the generation of the floating rust of secondary, for passivation creates conditions; After matting, refill de-mineralized water and circulate, boiler is carried out rinsing.
Add rinsing liquid (like Hydrocerol A) and inhibiter in the system, add ammoniacal liquor adjustment pH value to 3.5～4, temperature is controlled at 75～90 ℃, circulates 2 hours.
4, passivation
Comprise the preparation passivating solution and boiler is carried out two links of passivation.
(1) preparation passivating solution: passivating solution comprises component: methyl alcohol, sodium pyrosulfate, hydrazine, tri alkyl ammomium chloride, ammoniacal liquor and water; The content of each component in every liter of passivating solution is: methyl alcohol 150mg/L; Sodium pyrosulfate 750mg/L, hydrazine 750mg/L, tri alkyl ammomium chloride 150mg/L; The consumption of ammoniacal liquor is as the criterion water surplus with pH value to 8～12 of regulating passivating solution.
(2) boiler is carried out passivation: after rinsing finished, rinsing liquid did not discharge, and under recurrent state, regulated about rinsing liquid pH value to 7 with ammoniacal liquor earlier, added the passivating solution that makes in the step (1) then, under 15～35 ℃ of conditions, circulated 8～12 hours.Passivation finishes and bleeds off passivating solution and get final product.
Detection is learnt: the boiler after passivation technology is handled; Its internal surface forms the complete compact protective film of one deck; Inwall does not have the generation of the floating rust of secondary, does not have point corrosion yet, on the boiler surfaces after the selected passivation, oozes red liquid of 0.1ml acid copper sulfate with the 0.5ml glass syringe; All changing red time from the boiler surfaces after red some drop to the passivation to red liquid by blueness with the stopwatch record, is 15 seconds.
Embodiment 2:
Except that following step was distinguished to some extent, other were with embodiment 1.
4, passivation
Comprise the preparation passivating solution and boiler is carried out two links of passivation.
(1) preparation passivating solution: passivating solution comprises component: methyl alcohol, sodium pyrosulfate, hydrazine, tri alkyl ammomium chloride, ammoniacal liquor and water; The content of each component in every liter of passivating solution is: methyl alcohol 120mg/L; Sodium pyrosulfate 800mg/L, hydrazine 800mg/L, tri alkyl ammomium chloride 120mg/L; The consumption of ammoniacal liquor is as the criterion water surplus with pH value to 8～12 of regulating passivating solution.
Embodiment 3:
Except that following step was distinguished to some extent, other were with embodiment 1.
4, passivation
Comprise the preparation passivating solution and boiler is carried out two links of passivation.
(1) preparation passivating solution: passivating solution comprises component: methyl alcohol, sodium pyrosulfate, hydrazine, tri alkyl ammomium chloride, ammoniacal liquor and water; The content of each component in every liter of passivating solution is: methyl alcohol 160mg/L; Sodium pyrosulfate 700mg/L, hydrazine 700mg/L, tri alkyl ammomium chloride 160mg/L; The consumption of ammoniacal liquor is as the criterion water surplus with pH value to 8～12 of regulating passivating solution.
Claims (2)
1. the passivation technology after the boiler matting is characterized in that, may further comprise the steps:
(1) preparation passivating solution: passivating solution comprises component: methyl alcohol, sodium pyrosulfate, hydrazine, tri alkyl ammomium chloride, ammoniacal liquor and water; The content of each component in every liter of passivating solution is: methyl alcohol 120～160mg/L; Sodium pyrosulfate 700～800mg/L, hydrazine 700～800mg/L, tri alkyl ammomium chloride 120～160mg/L; The consumption of ammoniacal liquor is as the criterion water surplus with pH value to 8～12 of regulating passivating solution;
(2) boiler is carried out passivation: the boiler after qualified through matting adds the passivating solution that makes in the step (1), under 15～35 ℃ of conditions, circulates 8～12 hours.
2. the passivation technology after the boiler matting according to claim 1; It is characterized in that; Methyl alcohol, sodium pyrosulfate, hydrazine and the tri alkyl ammomium chloride content in every liter of passivating solution is respectively in the said passivating solution: methyl alcohol 150mg/L; Sodium pyrosulfate 750mg/L, hydrazine 750mg/L, tri alkyl ammomium chloride 150mg/L.
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| CN 201210043011 CN102586772B (en) | 2012-02-24 | 2012-02-24 | Passivation process after chemical cleaning of boiler |
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| CN102586772B CN102586772B (en) | 2013-08-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418562A (en) * | 2013-08-09 | 2013-12-04 | 国家电网公司 | Water-cooled wall chemical cleaning monitoring tube |
| CN104949570A (en) * | 2014-03-26 | 2015-09-30 | 东莞新科技术研究开发有限公司 | Method for washing boiler |
| CN106032966A (en) * | 2015-03-18 | 2016-10-19 | 东莞新科技术研究开发有限公司 | Method for cleaning heat exchangers |
| CN109652789A (en) * | 2019-03-04 | 2019-04-19 | 徐超 | A kind of processing method on boiler inner wall surface |
Citations (3)
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|---|---|---|---|---|
| DE10139930A1 (en) * | 2001-08-14 | 2003-04-30 | Daimler Chrysler Ag | Production of electrically conducting nitride layers on chromium-containing metal alloys comprises converting the natural electrically non-conducting passivating layer |
| CN1754985A (en) * | 2004-09-29 | 2006-04-05 | 上海万森水处理有限公司 | Metal surface passivant and its using method |
| US20100068556A1 (en) * | 2005-12-09 | 2010-03-18 | General Electric Company | Diffusion barrier layer and methods of forming |
-
2012
- 2012-02-24 CN CN 201210043011 patent/CN102586772B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10139930A1 (en) * | 2001-08-14 | 2003-04-30 | Daimler Chrysler Ag | Production of electrically conducting nitride layers on chromium-containing metal alloys comprises converting the natural electrically non-conducting passivating layer |
| CN1754985A (en) * | 2004-09-29 | 2006-04-05 | 上海万森水处理有限公司 | Metal surface passivant and its using method |
| US20100068556A1 (en) * | 2005-12-09 | 2010-03-18 | General Electric Company | Diffusion barrier layer and methods of forming |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418562A (en) * | 2013-08-09 | 2013-12-04 | 国家电网公司 | Water-cooled wall chemical cleaning monitoring tube |
| CN104949570A (en) * | 2014-03-26 | 2015-09-30 | 东莞新科技术研究开发有限公司 | Method for washing boiler |
| CN104949570B (en) * | 2014-03-26 | 2019-02-26 | 东莞新科技术研究开发有限公司 | The cleaning method of boiler |
| CN106032966A (en) * | 2015-03-18 | 2016-10-19 | 东莞新科技术研究开发有限公司 | Method for cleaning heat exchangers |
| CN109652789A (en) * | 2019-03-04 | 2019-04-19 | 徐超 | A kind of processing method on boiler inner wall surface |
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| CN102586772B (en) | 2013-08-21 |
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Owner name: SCIENTIFIC GREEN (SHANDONG) ENVIRONMENTAL TECHNOLO Free format text: FORMER NAME: JINING SCIENT GREEN WATER TREATMENT CO., LTD. |
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Address after: 272415 Jiaxiang economic and Technological Development Zone, Shandong, Jining Patentee after: Sunny (Shandong) Environment Technology Co., Ltd. Address before: 272415 Jiaxiang economic and Technological Development Zone, Shandong, Jining Patentee before: Jining Scintific Green Water-treating Co.,Ltd. |