CN102586772B - Passivation process after chemical cleaning of boiler - Google Patents
Passivation process after chemical cleaning of boiler Download PDFInfo
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- CN102586772B CN102586772B CN 201210043011 CN201210043011A CN102586772B CN 102586772 B CN102586772 B CN 102586772B CN 201210043011 CN201210043011 CN 201210043011 CN 201210043011 A CN201210043011 A CN 201210043011A CN 102586772 B CN102586772 B CN 102586772B
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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 dirty classes and corrosion product, also makes the metallic surface be converted into active state, very easily produces corrosion, makes the boiler internal surface produce situations such as the floating rust of secondary and 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, will influence the effect of whole cleaning, 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 as stove water iron level is hiding all may take place, thereby cause burn into fouling and the salification of boiler heating power system, bring many problems to follow-up work.
In May, 2011, the peaceful flat coal head thermoelectric power station 130T/H of the fertilizer plant boiler of Vietnam is because of the duration anxiety, Vietnam owner is not enough to the passivation procedure understanding of boiler in addition, after matting finishes, omit passivation procedure and directly started boiler, 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 steam turbine, more seriously can cause boiler tube to cause underdeposit corrosion because of rust deposite, cause the boiler tube booster and influence 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, according to this regulation, annually needs cleaning amount to steam output about 5 * 10
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 the floating rust of the very fast generation secondary of boiler; not only influenced 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 protection effect of these passivation technologies is difficult people's will to the greatest extent; it is very few to satisfy in 20 days rustless technology, let alone the boiler that the construction period is prolonged 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, 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 finished, passivating solution was at the protective membrane of metal base surface generation one deck even compact of boiler, although thickness only has tens
But can effectively resist corrosive medium erosion and can secluding air, the shelf time after the boiler matting is prolonged greatly.
Passivation technology after the described 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.
Clean and use this passivation technology in the engineering at the cleaning of Ganzhou biological power plant 130t/H boiler, the peaceful flat 4*220t/H boiler of Vietnam, 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 reached 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, the scavenging pump access doors, 10, scavenging pump outlet portal, 11, scavenger circuit I access doors, 12, scavenger circuit I outlet portal, 13, scavenger circuit II access doors, 14, scavenger circuit recirculation door, 15, 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 drawings and Examples.
Embodiment 1:
Matting and passivation with Ganzhou biological power plant 130t/H boiler are example, and its operation steps is as follows:
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 circulation flushing to the limpid back of 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 (as 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, ferric oxide dirt in the system of removing etc., and acidic cleaner (as 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 carry out water flushing completely after matting, 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 (as citric acid) and inhibiter in the system, add ammoniacal liquor and adjust 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; there is not point corrosion yet; boiler surfaces after selected passivation oozes red liquid of 0.1ml acid copper sulfate with the 0.5ml glass syringe; boiler surfaces to red liquid after recording from red some drop to passivation with stopwatch all changes the red time into by blueness, is 15 seconds.
Embodiment 2:
Except 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 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 described 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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| CN103418562A (en) * | 2013-08-09 | 2013-12-04 | 国家电网公司 | Water-cooled wall chemical cleaning monitoring tube |
| 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 |
| CN109652789B (en) * | 2019-03-04 | 2020-09-11 | 安徽盛元合同能源管理有限责任公司 | Method for treating surface of inner wall of boiler |
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| DE10139930B4 (en) * | 2001-08-14 | 2005-09-15 | Daimlerchrysler Ag | Process for the production of electrically conductive nitride layers on chromium-containing metal alloys |
| 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 |
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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. |