CN101575708A - Washing liquid applied to station boiler and washing method - Google Patents
Washing liquid applied to station boiler and washing method Download PDFInfo
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- CN101575708A CN101575708A CNA2009101474697A CN200910147469A CN101575708A CN 101575708 A CN101575708 A CN 101575708A CN A2009101474697 A CNA2009101474697 A CN A2009101474697A CN 200910147469 A CN200910147469 A CN 200910147469A CN 101575708 A CN101575708 A CN 101575708A
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- scavenging solution
- edta
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Abstract
The invention discloses a washing liquid applied to a station boiler and a washing method; wherein the washing liquid comprises the following components according to mass percent: 4-12% of ethylene diamine tetraacetic acid(EDTA) and ethylene diamine tetraacetic acid disodium salt, moderate amount of sodium hydroxide, 0.2-0.3% of methenamine, 0.1-0.2% of thiourea or di-o-tolyl-thiourea, 0.05-0.08% of mercaptobenzothiazole, 0.01-.0.3% of alkylphenol polyethenoxy ether(OP-10), 0.03-0.06% of octyl phenol polyethenoxy ether (TX-10), and the excess of water. In the method of the invention, processes such as acid cleaning, passivation and inhibition are organically combined, thus simplifying the cleaning sequences; as alkaline matter is generated by the washing liquid in the process of decomposition and incrustation dissolving, pH value of the washing liquid can be increased along with the washing process and the pH value is more than 8.5, thus realizing one-step completion of washing and passivation.
Description
Technical field
The invention belongs to boiler and clean, be specifically related to a kind of scavenging solution and purging method that is used for station boiler with chemicals and method.
Background technology
The large-size thermal power plant boiler is all must carry out matting when the dirty amount of boiler tube reaches after respective standard requires at construction period or unit operation for some time, thereby reaches the purpose of saving energy and reduce the cost and preventing the furnace tube corrosion booster with the generating surface that obtains cleaning.Usually the purging method of Cai Yonging comprises use hydrochloric acid, citric acid, EDTA ammonia salt, hydrofluoric acid, thionamic acid and sulfuric acid etc., need all to comprise that cleaning and descalings such as pickling, water flushing, rinsing and passivation two big steps just can finish, scavenging period is long, cleaning complexity and a large amount of de-mineralized waters that consume, the liquid waste disposal amount is big, is difficult to satisfy environmental requirement comprehensively.
Summary of the invention
The objective of the invention is in order to overcome the deficiencies in the prior art scavenging solution that is used for station boiler and the purging method that provide that a kind of technology is simple, scavenging period is short, can once finish cleaning and descaling and passivation step.
Purpose of the present invention is realized by following technical scheme:
The present invention is used for the scavenging solution of station boiler, mainly is made up of following component by mass percent:
Ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA 4～12%, sodium hydroxide is an amount of, urotropine 0.2～0.3%, thiocarbamide or di-o-tolyl-thiourea 0.1～0.2%, mercaptobenzothiazole 0.05-0.08%, alkylphenol polyoxyethylene (OP-10) 0.01～0.03%, polyoxyethylene octylphenol ether (TX-10) 0.03～0.06%, surplus is a water;
The mass ratio of described ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA is 1: 4～6;
Described sodium hydroxide is as ionic membrane caustic soda, and its content is as the criterion to regulate scavenging solution initial pH value 4.5～5.5.
The present invention adopts above-mentioned scavenging solution to be used for the purging method of station boiler, may further comprise the steps:
(1) the debugging feedwater is depressed into and meets the requirements, and isolates and the cleaning system without interaction;
(2) prepare scavenging solution by the component of above-mentioned setting, and inject boiler body and carry out cleaning and descaling and passivation;
(3) cleaning parameters is controlled to be:
Rinse liquid temperature is controlled at 95～160 ℃, and clean endpoint control pH value is more than 8.5, and boiler cooling cooling when scavenging solution pH value reaches 9.0 after is discharged the end cleaning below the scavenging solution to 60 ℃.
Scavenging solution heats up and adopts the raise steam heating mode, and the unit that does not possess ignition condition can utilize the high pressure heater heating of unit own.
Concentration of lotion and temperature should be distinguished to some extent according to unit and furnace tube deposition amount, usually rinse liquid temperature is controlled at 95～140 ℃, clean endpoint control pH value is more than 8.5, as clean later stage scavenging solution pH value still less than 8.5, should rapidly rinse liquid temperature be raised to about 160 ℃, be raised to more than 8.5 until scavenging solution pH value.
The adding of scavenging solution can use scavenging solution injection pump and scavenging solution to inject pipe arrangement by the interim cleaning case to feedwater pipe arrangement feed flow, and clean-out system is injected boiler systems continuously.Unit for boiler drainage pump and drain tank need not connect temporary pipeline, makes up a prescription and finishes at drain tank, uses drainage pump, adds medicine to boiler body through the jellyfish pipe that charges and discharge of boiler.
In the boiler cleaning process, because scavenging solution produces alkaline matter in molten dirt and decomposition course, its principle is as follows in the pickling later stage:
Main component in the dirt is a Z 250, is cleaned agent complexing dissolving back during cleaning following reaction takes place, and emits a large amount of OH
-, Fe
3O
4+ 4H
2O → 2Fe
2++ Fe
3++ 4OH
-
The pH value of scavenging solution is raise with wash course, make the pH value of cleaning the later stage scavenging solution, thereby realization cleaning and descaling and one step of passivation finish greater than 8.5.
In the EDTA cleaning process, the pH value of scavenging solution can increase, and the pH value of keeping terminal point depends on whether metal can be passivated.A large amount of tests and cleaning practice prove: scavenging solution pH was greater than 8.5 o'clock, just can make iron and steel enter stable passivation region, the corrosion resisting property of passive film is better, but the too high meeting of pH value causes the dissolving of passive film and make ferric ion form precipitation, thereby is attached to the quality that the metallic surface influences passive film.So the optimal ph of terminal point is between 8.5 to 9.2.
After adopting scavenging solution of the present invention and purging method boiler rinsing, the pipe cutting inspection: the clean smooth no copper facing in metallic surface, form the pewter passive film, erosion rate is lower than national standard.Prepurging, passivation effect are good.
The present invention organically combines processes such as pickling, passivation, inhibition, only need a dosing just can finish the cleaning of boiler, simplified cleaning step, shortened scavenging period, originally clean generally and need 10 to 15 days, adopt the present invention can finish the work of a unit matting at 3-5 days usually from being installed to clean to finish.
Embodiment
Be embodiment with a 200MW operation of pickling boiler below, the present invention is further illustrated.
Embodiment 1
The present invention is used for the scavenging solution of station boiler, mainly is made up of following component by mass percent:
Ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA 4%, sodium hydroxide is an amount of, urotropine 0.2%, thiocarbamide or di-o-tolyl-thiourea 0.1%, mercaptobenzothiazole 0.08%, alkylphenol polyoxyethylene (OP-10) 0.03%, polyoxyethylene octylphenol ether (TX-10) 0.06%, surplus is a water;
The mass ratio of described ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA is 1: 4.
Embodiment 2
The present invention is used for the scavenging solution of station boiler, adopts the prescription of following mass percent:
Ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA 12%, sodium hydroxide is an amount of, urotropine 0.3%, thiocarbamide or di-o-tolyl-thiourea 0.2%, mercaptobenzothiazole 0.05%, alkylphenol polyoxyethylene (OP-10) 0.01%, polyoxyethylene octylphenol ether (TX-10) 0.03%, surplus is a water;
The mass ratio of described ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA is 1: 6.
Embodiment 3
The present invention is used for the scavenging solution of station boiler, adopts the prescription of following mass percent:
Ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA 8%, sodium hydroxide is an amount of, urotropine 0.25%, thiocarbamide or di-o-tolyl-thiourea 0.15%, mercaptobenzothiazole 0.06%, alkylphenol polyoxyethylene (OP-10) 0.02%, polyoxyethylene octylphenol ether (TX-10) 0.05%, surplus is a water;
The mass ratio of described ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA is 1: 5.
The content of sodium hydroxide is as the criterion to regulate scavenging solution initial pH value 4.5～5.5 in the foregoing description.
The present invention adopts above-mentioned scavenging solution to be used for the purging method of station boiler, may further comprise the steps:
(1) the debugging feedwater is depressed into and meets the requirements, and isolates and cleans system without interaction, comprise with clean range in the valve that links to each other with pipeline of equipment must close tightly, the device that should not clean in the drum, as cyclonic separator, must remove, water level is taken into account pipelines such as all instrument, sampling, dosing etc. and must be closed.In addition, if superheater should not taked sfgd. (as filling protection liquid) if do not participate in cleaning.
(2) prepare scavenging solution by the component of above-mentioned setting, and inject boiler body and carry out cleaning and descaling and passivation, make up a prescription and finish at drain tank, use drainage pump, the jellyfish pipe that charges and discharge through boiler is added medicine to boiler body, after steam water-level reaches medullary ray, stops medicine-feeding, the pass charges and discharge jellyfish pipe door and boiler is decided the comb valve, the firing up boiler rinsing;
(3) cleaning parameters is controlled to be:
120～140 ℃ of rinse liquid temperatures, clean endpoint pH value be more than 8.5, the flame-out cooling cooling of boiler after scavenging solution pH value reaches 9.0, and discharging below the scavenging solution to 60 ℃ finishes to clean.
As clean later stage scavenging solution pH value still less than 8.5, and should rapidly rinse liquid temperature be raised to about 160 ℃, be raised to more than 8.5 until scavenging solution pH value.
Claims (4)
1, a kind of scavenging solution that is used for station boiler, mainly form by following component by mass percent:
Ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA 4～12%, sodium hydroxide is an amount of, urotropine 0.2～0.3%, thiocarbamide or di-o-tolyl-thiourea 0.1～0.2%, mercaptobenzothiazole 0.05-0.08%, alkylphenol polyoxyethylene (OP-10) 0.01～0.03%, polyoxyethylene octylphenol ether (TX-10) 0.03～0.06%, surplus is a water;
The mass ratio of described ethylenediamine tetraacetic acid (EDTA) (EDTA) and disodium EDTA is 1: 4～6;
Described sodium hydroxide is as ionic membrane caustic soda, and its content is as the criterion to regulate scavenging solution initial pH value 4.5～5.5.
2, a kind of purging method that adopts the described scavenging solution of claim 1 to be used for station boiler may further comprise the steps:
(1) the debugging feedwater is depressed into and meets the requirements, and isolates and the cleaning system without interaction;
(2) prepare scavenging solution by the component of above-mentioned setting, and inject boiler body and carry out cleaning and descaling and passivation;
(3) cleaning parameters is controlled to be:
Rinse liquid temperature is controlled at 95～160 ℃, and clean endpoint control pH value is more than 8.5, and boiler cooling cooling when scavenging solution pH value reaches 9.0 after is discharged the end cleaning below the scavenging solution to 60 ℃.
3, the purging method that is used for station boiler according to the described scavenging solution of claim 2 is characterized in that scavenging solution intensification employing raise steam heating mode, and the unit that does not possess ignition condition can utilize the high pressure heater heating of unit own.
4, the purging method that is used for station boiler according to the described scavenging solution of claim 2, it is characterized in that concentration of lotion and temperature should distinguish to some extent according to unit and furnace tube deposition amount, usually rinse liquid temperature is controlled at 95～140 ℃, clean endpoint control pH value is more than 8.5, as clean later stage scavenging solution pH value still less than 8.5, should rinse liquid temperature be raised to 160 ℃ rapidly, be raised to more than 8.5 until scavenging solution pH value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101474697A CN101575708A (en) | 2009-01-22 | 2009-06-08 | Washing liquid applied to station boiler and washing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910042590.3 | 2009-01-22 | ||
| CN200910042590 | 2009-01-22 | ||
| CNA2009101474697A CN101575708A (en) | 2009-01-22 | 2009-06-08 | Washing liquid applied to station boiler and washing method |
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| CN101575708A true CN101575708A (en) | 2009-11-11 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102242367A (en) * | 2011-06-17 | 2011-11-16 | 陕西省石油化工研究设计院 | Multifunctional novel ethylene diamine tetraacetic acid (EDTA) cleaning corrosion inhibitor |
| CN102719834A (en) * | 2012-06-04 | 2012-10-10 | 西安热工研究院有限公司 | Chemical cleaning agent for superheater heat exchange pipe of station boiler |
| WO2013056489A1 (en) * | 2011-10-20 | 2013-04-25 | 宁夏电力科学研究院 | Process for low temperature chemical cleaning and passivation in boiler of thermal power plant with edta |
| CN103510101A (en) * | 2013-09-26 | 2014-01-15 | 杨桂望 | Boiler cleaning agent |
| CN103710718A (en) * | 2013-12-11 | 2014-04-09 | 张啸 | Oxide skin cleaning agent and application thereof |
| CN104047007A (en) * | 2014-06-23 | 2014-09-17 | 梧州恒声电子科技有限公司 | Method for derusting copper and copper alloy |
| CN108486563A (en) * | 2018-03-23 | 2018-09-04 | 西安协力动力科技有限公司 | A kind of rinsing passivator and rinsing one step of passivation for station boiler chemical cleaning completes technique |
| CN109237459A (en) * | 2018-09-02 | 2019-01-18 | 青岛安装建设股份有限公司 | A kind of newly-built drum boiler chemical cleaning method |
| CN116293635A (en) * | 2023-03-30 | 2023-06-23 | 浙江合泰热电有限公司 | Method for combining pickling and baking |
-
2009
- 2009-06-08 CN CNA2009101474697A patent/CN101575708A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102242367A (en) * | 2011-06-17 | 2011-11-16 | 陕西省石油化工研究设计院 | Multifunctional novel ethylene diamine tetraacetic acid (EDTA) cleaning corrosion inhibitor |
| WO2013056489A1 (en) * | 2011-10-20 | 2013-04-25 | 宁夏电力科学研究院 | Process for low temperature chemical cleaning and passivation in boiler of thermal power plant with edta |
| CN102719834A (en) * | 2012-06-04 | 2012-10-10 | 西安热工研究院有限公司 | Chemical cleaning agent for superheater heat exchange pipe of station boiler |
| CN102719834B (en) * | 2012-06-04 | 2013-10-16 | 西安热工研究院有限公司 | Chemical cleaning agent for superheater heat exchange pipe of station boiler |
| CN103510101A (en) * | 2013-09-26 | 2014-01-15 | 杨桂望 | Boiler cleaning agent |
| CN103710718A (en) * | 2013-12-11 | 2014-04-09 | 张啸 | Oxide skin cleaning agent and application thereof |
| CN103710718B (en) * | 2013-12-11 | 2016-01-06 | 北京中电龙源环保科技有限公司 | A kind of oxide skin clean-out system and application thereof |
| CN104047007A (en) * | 2014-06-23 | 2014-09-17 | 梧州恒声电子科技有限公司 | Method for derusting copper and copper alloy |
| CN108486563A (en) * | 2018-03-23 | 2018-09-04 | 西安协力动力科技有限公司 | A kind of rinsing passivator and rinsing one step of passivation for station boiler chemical cleaning completes technique |
| CN109237459A (en) * | 2018-09-02 | 2019-01-18 | 青岛安装建设股份有限公司 | A kind of newly-built drum boiler chemical cleaning method |
| CN109237459B (en) * | 2018-09-02 | 2021-05-18 | 青岛安装建设股份有限公司 | Chemical cleaning method for newly-built drum furnace |
| CN116293635A (en) * | 2023-03-30 | 2023-06-23 | 浙江合泰热电有限公司 | Method for combining pickling and baking |
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Open date: 20091111 |