CN101498004A - Chemical scrubbing method for boiler - Google Patents
Chemical scrubbing method for boiler Download PDFInfo
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- CN101498004A CN101498004A CNA2008101768963A CN200810176896A CN101498004A CN 101498004 A CN101498004 A CN 101498004A CN A2008101768963 A CNA2008101768963 A CN A2008101768963A CN 200810176896 A CN200810176896 A CN 200810176896A CN 101498004 A CN101498004 A CN 101498004A
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Abstract
The invention relates to a method of cleaning a boiler, in particular to a method of chemically cleaning a boiler, which comprises the following steps: caustic cleaning, acid cleaning, rinsing, passivating and liquid waste processing. The invention has the advantages that: 1. raw material adopted in the whole cleaning process has little toxic side effect and is environment-friendly. 2. Technological mistaken ideas on cleaning various prior boilers are overcome. 3. Sequential processing is easy according to cleaning solutions.
Description
Technical field
The present invention relates to a kind of boiler washing method, particularly chemical scrubbing method for boiler.
Background technology
Along with the construction of large vol fired power generating unit, equipment material complicated, also more and more higher to the requirement of boiler chemical cleaning technology.The matting of boiler is to make boiler surface internal surface cleaning, prevent heating surface because of corrosion and fouling cause the requisite measure of accident, also is simultaneously to improve boiler thermal output, improve one of effective measure of unit water and steam quality.Chemical cleaning technology to boiler generally has at present: salt acid system, EDTA method, citric acid method.
Traditional hydrochloric acid cleans the restriction that is subjected to the cleaning equipment material, can not be used to have the cleaning of austenitic steel material equipment, and concentrated hydrochloric acid has volatility, and its volatilization gas is harmful.
With the cleaning of EDTA method bigger drug dissolving tank must be arranged, be 200m as the volume that cleans power plant's electricity generation boiler drug dissolving tank
3About; EDTA method cleaning requirement temperature is 130 ℃, and the drug expenditure height does not reclaim if do not carry out EDTA, then causes waste, adopts the EDTA method to clean to such an extent that advantage is can not work the mischief to metal, applicable to common various boiler steels.
The citric acid cleaning generally can not work the mischief to steel yet, applicable to common various boiler steels, but the temperature that present cleaning requires citric acid method to clean must be between 75-90 ℃, and the citric acid price is more expensive, the liquid waste disposal difficulty, send into the boiler burning again after generally will being sprayed to coal yard, and in citric acid cleans, iron concentration in scavenging solution is too big, the pH value may generate the precipitation of ironic citrate greater than 4 o'clock, the effect that influence is cleaned, clean according to boiler simultaneously and stipulate to use hydrogen peroxide to carry out passivation with after the citric acid rinsing.
Chang Yong sodium nitrite passivation method in recent years, passivation technology is very ripe, but the waste liquid environmental pollution is bigger, and needing could qualified discharge through after a while processing with the Sodium Nitrite treatment agent, and the treatment agent expense is higher, during liquid waste disposal certain operational danger need be arranged carefully.
Summary of the invention
The objective of the invention is to overcome the defective that prior art exists, a kind of clean range is provided, cleaning, good passivation effect, technology is workable, compliance with environmental protection requirements.
For achieving the above object, technical scheme of the present invention is: a kind of chemical scrubbing method for boiler, and its cleaning step is as follows:
A, alkali cleaning: water dilutes degreaser XDA5, make mass concentration and be 0.5-1% alkaline wash, add the foam in the proper quantity of defoaming agent elimination alkaline wash then, when being warming up to 40-50 ℃, carry out wash cycles, scavenging period 4-6 hours is then with the alkaline wash emptying, water washes to pH Zhi ≦ 9, and water quality is transparent;
B, pickling: with mass concentration is 6-10%, temperature is carried out wash cycles at 55-60 ℃ thionamic acid, when pickle solution concentration and iron concentration tend towards stability, control scavenging period 6-10 hours, with the pickle solution emptying, pH value 4-4.5 is controlled in the water flushing then;
C, rinsing: adopting mass concentration is that 0.1-0.3% citric acid solution is a rinsing solution, adds the citric acid inhibiter, and adjusting rinsing solution pH value with ammoniacal liquor is 3-3.5, add EDTA as rinse aid, the rinsing that circulates, the rinsing temperature is controlled at 55-60 ℃, 2 hours rinsing time; Wherein the mass concentration of citric acid inhibiter is 0.1% in the rinsing solution, and the mass concentration of EDTA is 0.05%;
D, passivation: adopt mass concentration be 0.2-0.5% hydrogen peroxide as passivating dip, and add hydrogen peroxide stabilizer PBTCA, the Passivation Treatment that circulates, passivation temperature is controlled at 50-55 ℃, pH value 9.5-10, passivation time 4-6 hour; Wherein the mass concentration of stablizer PBTCA is 0.05% in the passivating dip.
E, liquid waste disposal: spent pickle liquor enters the spent pickle liquor pond, and with the discharging of in the sodium hydroxide and back, other waste liquid directly discharges.
Characteristics of the present invention are: 1, the raw material toxic side effect of whole cleaning process employing is little, environmentally friendly.XDA5 has non-volatile, no stink and the characteristics minimum to human toxicity.Thionamic acid and its esters and multiple metallic compound can both generate the solubility salt, have solubleness height in water, the characteristics little to corrosion of metal.As clean-out system, the thionamic acid aqueous solution can be removed iron rust, incrustation scale and the corrosion product of the equipment surface of materials manufacturings such as iron, steel, copper, stainless steel; Rinsing adopts citric acid, passivation to adopt hydrogen peroxide, makes whole cleaning process as safe as a house to human and environment, and essentially no toxic side effect; 2, the technology mistaken ideas that present various boiler cleans have been overcome.According to People's Republic of China's power industry standard, DL/7794-2001 " heat power plant boiler matting guide rule " regulation, citric acid rinsing temperature is 75-90 ℃, but this temperature is unfavorable for the safe operation of scavenging pump, and a large amount of steam of need consumption that heat up, by evidence, when the rinsing temperature is 55-60 ℃, and add auxiliary agent EDTA, not only guarantee wash effect but also save energy, and do not need cooling just can directly carry out passivation.And domesticly have the passivation of article report hydrogen peroxide influence passivation effect with the citric acid rinsing, and the inventor has obtained good cleaning and passivation effect by a large amount of technology that experiment showed, the rinsing of use low temperature citric acid, hydrogen peroxide passivation.3, easy according to the subsequent disposal of scavenging solution.Technical scheme of the present invention is in cleaning process, and spent pickle liquor enters the spent pickle liquor pond, and with the discharging of in the sodium hydroxide and back, other waste liquid can directly discharge, and compares with existing boiler washing method, cleans and has saved a large amount of scavenging solution processing costss.
Embodiment
Utilize purging method of the present invention that No. two unit boilers of Lingwu, Ningxia power plant are cleaned.
No. two unit boilers of Lingwu, Ningxia power plant are that Shanghai Furnace Factory Co., Ltd makes, and boiler model: SG-2093/17.5-M917 is subcritical pressure boiler pump circulation dum boiler.The boiler-steam dome material is BHW35, and the water wall material is 20G, SA-210A1, and the economizer material is SA-210C.
Converge the deployment scenarios of water bag under collection case and the water wall according to this boiler downtake and boiler water circulating pump and determine that the mode of connection of matting is: the scavenging pump outlet by interim pipe coupling to the service platform master motorized valve bypass gap economizer end that feeds water, the matting tank inlet is by interim pipe coupling Zuoren hole behind the water bag to the water wall, form the water wall → Xia Shuibao of cleaning case → scavenging pump → economizer → drum → all around → be back to the cleaning system of cleaning case again, start boiler water circulating pump when cleaning simultaneously and carry out the water wall → drum of downtake → converge collection case → boiler water circulating pump → Xia Shuibao → all around → again to downtake.
The cleaning program according to the present invention, during electric Ningxia Lingwu electricity generating corporation, Ltd to China No. two unit boiler matting, cleaning total water capacity is 416 cubic metres, and cleaning process the steps include: according to the requirement of " heat power plant boiler matting guide rule " (DL/T 794-2001)
1, alkali cleaning: water dilutes degreaser XDA5, make mass concentration and be about 0.8% alkaline wash, add proper quantity of defoaming agent then, eliminate the foam in the alkaline wash, when being warming up to 45 ℃ of left and right sides, carry out wash cycles, scavenging period 4 hours, with the alkaline wash emptying, water washes to pH Wei ≦ 9 then, and water quality is transparent; Defoamer adopts the existing material of " heat power plant boiler matting guide rule " regulation.
2, pickling: after alkali cleaning finishes, it with mass concentration 8% thionamic acid, controlled temperature is about 55 ℃, carry out wash cycles, when pickle solution concentration with iron concentration tends towards stability, cleaning substantially in the monitor tube, recirculation pickling in 1 hour finishes, and then with the pickle solution emptying, water flushing control pH is 4-4.5;
3, rinsing: after pickling finishes, adopting mass concentration is that 0.2% citric acid solution is a rinsing solution, add the citric acid inhibiter, adjust the pH value to 3 of rinsing solution with ammoniacal liquor, add EDTA as rinse aid, the rinsing that circulates, the rinsing temperature is controlled at 55-60 ℃, 2 hours rinsing time; Wherein the mass concentration of citric acid inhibiter is 0.1% in the rinsing solution, and the mass concentration of EDTA is 0.05%;
4, passivation: adopting mass concentration is that 0.4% hydrogen peroxide is as passivating dip, and adding hydrogen peroxide stabilizer PBTCA, slow down the decomposition of hydrogen peroxide, the Passivation Treatment that circulates then, passivation temperature is controlled at 50-55 ℃, pH value about 9.5, passivation time 4-6 hour; Wherein the mass concentration of stablizer PBTCA is 0.05% in the passivating dip.
E, liquid waste disposal: spent pickle liquor enters the spent pickle liquor pond, and with the discharging of in the sodium hydroxide and back, other waste liquid directly discharges.
After matting finishes, according to " heat power plant boiler matting guide rule " (DL/T794-2001), this is cleaned employing pipe cutting inspection method, carry out grade estimation, this boiler matting grade estimation is good.
Determine by this test: control rinsing liquid pH value adds citric acid inhibiter 0.1% simultaneously 3.0-3.5 when adopting the citric acid rinsing, does not influence passivation effect.
Claims (1)
1, a kind of chemical scrubbing method for boiler, its cleaning step is as follows:
A, alkali cleaning: water dilutes degreaser XDA5, make mass concentration and be 0.5-1% alkaline wash, add the foam in the proper quantity of defoaming agent elimination alkaline wash then, when being warming up to 40-50 ℃, carry out wash cycles, scavenging period 4-6 hours is then with the alkaline wash emptying, water washes to pH Zhi ≦ 9, and water quality is transparent;
B, pickling: with mass concentration is 6-10%, temperature is carried out wash cycles at 50-60 ℃ thionamic acid, when pickle solution concentration and iron concentration tend towards stability, control scavenging period 6-10 hours, with the pickle solution emptying, pH value 4-4.5 is controlled in the water flushing then;
C, rinsing: adopting mass concentration is that 0.1-0.3% citric acid solution is a rinsing solution, adds the citric acid inhibiter, and adjusting rinsing solution pH value with ammoniacal liquor is 3-3.5, add EDTA as rinse aid, the rinsing that circulates, the rinsing temperature is controlled at 55-60 ℃, 2 hours rinsing time; Wherein the mass concentration of citric acid inhibiter is 0.1% in the rinsing solution, and the mass concentration of EDTA is 0.05%;
D, passivation: adopt mass concentration be 0.2-0.5% hydrogen peroxide as passivating dip, and add hydrogen peroxide stabilizer PBTCA, the Passivation Treatment that circulates, passivation temperature is controlled at 50-55 ℃, pH value 9.5-10, passivation time 4-6 hour; Wherein the mass concentration of stablizer PBTCA is 0.05% in the passivating dip.
E, liquid waste disposal: spent pickle liquor enters the spent pickle liquor pond, and with the discharging of in the sodium hydroxide and back, other waste liquid directly discharges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101768963A CN101498004A (en) | 2008-11-21 | 2008-11-21 | Chemical scrubbing method for boiler |
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| CNA2008101768963A CN101498004A (en) | 2008-11-21 | 2008-11-21 | Chemical scrubbing method for boiler |
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Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425778A (en) * | 2011-10-20 | 2012-04-25 | 宁夏电力公司电力科学研究院 | Process of carrying out low-temperature chemical cleaning passivation on thermal power plant boiler by utilizing EDTA (Ethylene Diamine Tetraacetic Acid) |
| CN102965673A (en) * | 2012-11-28 | 2013-03-13 | 中国铝业股份有限公司 | Method for cleaning stainless steel impeller of water pump |
| CN103628076A (en) * | 2013-11-11 | 2014-03-12 | 青岛文创科技有限公司 | Citric acid compound corrosion inhibitor |
| CN104406452A (en) * | 2014-11-14 | 2015-03-11 | 攀枝花钢企欣宇化工有限公司 | Water scale cleaning method for nickel heat exchanger |
| CN104550099A (en) * | 2014-12-18 | 2015-04-29 | 广州飞机维修工程有限公司 | Automatic cleaning system for civil aircraft kitchen water boiler |
| CN104726881A (en) * | 2015-02-12 | 2015-06-24 | 国家电网公司 | Efficient environment-friendly chemical cleaning method |
| CN104878396A (en) * | 2015-06-02 | 2015-09-02 | 山西太钢不锈钢股份有限公司 | Boiler pickling and passivating process |
| CN105112929A (en) * | 2015-09-11 | 2015-12-02 | 江苏隆瑞化学有限公司 | Thermal-state rapid silicon cleaning pretreatment filming agent for power station boiler |
| CN105135412A (en) * | 2015-09-17 | 2015-12-09 | 陕西创英电力工程有限公司 | Unit cleaning technology of supercritical boiler |
| CN105180141A (en) * | 2015-08-19 | 2015-12-23 | 河南第一火电建设公司 | Efficient cleaning system for boiler and passive film of water supply system |
| CN105803470A (en) * | 2014-12-29 | 2016-07-27 | 东莞新科技术研究开发有限公司 | Chemical cleaning method |
| CN105928417A (en) * | 2016-04-28 | 2016-09-07 | 浙江天地环保科技有限公司 | Heating medium water pipe corrosion resisting system and method |
| CN105987373A (en) * | 2015-02-15 | 2016-10-05 | 东莞新科技术研究开发有限公司 | Boiler cleaning method |
| CN105987372A (en) * | 2015-02-15 | 2016-10-05 | 东莞新科技术研究开发有限公司 | Boiler cleaning method |
| CN105983556A (en) * | 2015-02-25 | 2016-10-05 | 东莞新科技术研究开发有限公司 | Cleaning method for water temperature machine |
| 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 |
| CN106369580A (en) * | 2016-09-20 | 2017-02-01 | 广东电网有限责任公司电力科学研究院 | 38 t/h drum boiler soda boiling debugging process |
| CN107058996A (en) * | 2016-12-16 | 2017-08-18 | 安徽宝恒新材料科技有限公司 | A kind of stainless steel surfaces deactivating process for the treatment of |
| CN107101525A (en) * | 2017-03-21 | 2017-08-29 | 华电电力科学研究院 | A kind of method cleaned to power plant boiler superheater cyclic chemical |
| CN107747728A (en) * | 2017-10-24 | 2018-03-02 | 广州市金润环保科技有限公司 | A kind of cleaning method of boiler |
| CN107937926A (en) * | 2017-11-29 | 2018-04-20 | 郑州荣奇热电能源有限公司 | Steam condenser of steam turbine set cooling pipe chemical cleaning technology |
| CN108955344A (en) * | 2018-07-17 | 2018-12-07 | 江苏安泰安全技术有限公司 | A kind of method for cleaning of chemical industry pipe heat exchanger |
| 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 |
| CN110921726A (en) * | 2018-09-19 | 2020-03-27 | 东莞新科技术研究开发有限公司 | Filter screen cleaning method |
| CN113551219A (en) * | 2021-07-19 | 2021-10-26 | 国家能源集团福建能源有限责任公司 | Boiler unit cleaning method |
| CN113819125A (en) * | 2021-09-26 | 2021-12-21 | 陕西汇能通创环保工程有限公司 | Tank leakage repairing method |
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2008
- 2008-11-21 CN CNA2008101768963A patent/CN101498004A/en active Pending
Cited By (34)
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| CN102425778A (en) * | 2011-10-20 | 2012-04-25 | 宁夏电力公司电力科学研究院 | Process of carrying out low-temperature chemical cleaning passivation on thermal power plant boiler by utilizing EDTA (Ethylene Diamine Tetraacetic Acid) |
| 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 |
| CN102425778B (en) * | 2011-10-20 | 2013-10-16 | 宁夏电力公司电力科学研究院 | Process of carrying out low-temperature chemical cleaning passivation on thermal power plant boiler by utilizing EDTA (Ethylene Diamine Tetraacetic Acid) |
| CN102965673A (en) * | 2012-11-28 | 2013-03-13 | 中国铝业股份有限公司 | Method for cleaning stainless steel impeller of water pump |
| CN103628076A (en) * | 2013-11-11 | 2014-03-12 | 青岛文创科技有限公司 | Citric acid compound corrosion inhibitor |
| CN104406452A (en) * | 2014-11-14 | 2015-03-11 | 攀枝花钢企欣宇化工有限公司 | Water scale cleaning method for nickel heat exchanger |
| CN104550099A (en) * | 2014-12-18 | 2015-04-29 | 广州飞机维修工程有限公司 | Automatic cleaning system for civil aircraft kitchen water boiler |
| CN104550099B (en) * | 2014-12-18 | 2016-07-06 | 广州飞机维修工程有限公司 | Aircarrier aircraft kitchen water boiling device automatic cleaning system |
| CN105803470A (en) * | 2014-12-29 | 2016-07-27 | 东莞新科技术研究开发有限公司 | Chemical cleaning method |
| CN104726881A (en) * | 2015-02-12 | 2015-06-24 | 国家电网公司 | Efficient environment-friendly chemical cleaning method |
| CN104726881B (en) * | 2015-02-12 | 2017-11-28 | 国家电网公司 | A kind of chemical cleaning method of high-efficiency environment friendly |
| CN105987373A (en) * | 2015-02-15 | 2016-10-05 | 东莞新科技术研究开发有限公司 | Boiler cleaning method |
| CN105987372A (en) * | 2015-02-15 | 2016-10-05 | 东莞新科技术研究开发有限公司 | Boiler cleaning method |
| CN105983556A (en) * | 2015-02-25 | 2016-10-05 | 东莞新科技术研究开发有限公司 | Cleaning method for water temperature machine |
| 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 |
| CN104878396A (en) * | 2015-06-02 | 2015-09-02 | 山西太钢不锈钢股份有限公司 | Boiler pickling and passivating process |
| CN105180141A (en) * | 2015-08-19 | 2015-12-23 | 河南第一火电建设公司 | Efficient cleaning system for boiler and passive film of water supply system |
| CN105180141B (en) * | 2015-08-19 | 2017-08-18 | 中国电建集团河南工程公司 | Boiler and water supply system passivating film high-efficient cleaning system |
| CN105112929A (en) * | 2015-09-11 | 2015-12-02 | 江苏隆瑞化学有限公司 | Thermal-state rapid silicon cleaning pretreatment filming agent for power station boiler |
| CN105135412A (en) * | 2015-09-17 | 2015-12-09 | 陕西创英电力工程有限公司 | Unit cleaning technology of supercritical boiler |
| CN105135412B (en) * | 2015-09-17 | 2018-09-14 | 陕西创英电力工程有限公司 | A kind of unit cleaning of super critical boiler |
| CN105928417B (en) * | 2016-04-28 | 2017-12-26 | 浙江天地环保科技有限公司 | A kind of heat medium water pipeline corrosion protection system and method |
| CN105928417A (en) * | 2016-04-28 | 2016-09-07 | 浙江天地环保科技有限公司 | Heating medium water pipe corrosion resisting system and method |
| CN106369580A (en) * | 2016-09-20 | 2017-02-01 | 广东电网有限责任公司电力科学研究院 | 38 t/h drum boiler soda boiling debugging process |
| CN107058996A (en) * | 2016-12-16 | 2017-08-18 | 安徽宝恒新材料科技有限公司 | A kind of stainless steel surfaces deactivating process for the treatment of |
| CN107101525A (en) * | 2017-03-21 | 2017-08-29 | 华电电力科学研究院 | A kind of method cleaned to power plant boiler superheater cyclic chemical |
| CN107747728A (en) * | 2017-10-24 | 2018-03-02 | 广州市金润环保科技有限公司 | A kind of cleaning method of boiler |
| CN107937926A (en) * | 2017-11-29 | 2018-04-20 | 郑州荣奇热电能源有限公司 | Steam condenser of steam turbine set cooling pipe chemical cleaning technology |
| CN108955344A (en) * | 2018-07-17 | 2018-12-07 | 江苏安泰安全技术有限公司 | A kind of method for cleaning of chemical industry pipe heat exchanger |
| 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 |
| CN110921726A (en) * | 2018-09-19 | 2020-03-27 | 东莞新科技术研究开发有限公司 | Filter screen cleaning method |
| CN113551219A (en) * | 2021-07-19 | 2021-10-26 | 国家能源集团福建能源有限责任公司 | Boiler unit cleaning method |
| CN113819125A (en) * | 2021-09-26 | 2021-12-21 | 陕西汇能通创环保工程有限公司 | Tank leakage repairing method |
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Application publication date: 20090805 |