CN101274803A - Softener for station boiler sediment incrustation and two-stage incrustation-removing method - Google Patents
Softener for station boiler sediment incrustation and two-stage incrustation-removing method Download PDFInfo
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- CN101274803A CN101274803A CNA2008100583902A CN200810058390A CN101274803A CN 101274803 A CN101274803 A CN 101274803A CN A2008100583902 A CNA2008100583902 A CN A2008100583902A CN 200810058390 A CN200810058390 A CN 200810058390A CN 101274803 A CN101274803 A CN 101274803A
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Abstract
The invention provides a softener of the scale that is difficult to be removed from a boiler used in a power station and a two-step washing scale removing method. The softener consists of the raw materials as follows based on the mass ratio: 0.5 to 7 percent of sodium ethylenediamine tetramethylene phosphonate, 0.6 to 8 percent of sodium polyacrylate, 10 to 40 percent of Na3PO4 question mark 12H2O, 8 to 35 percent of NaOH, 15 to 65 percent of Na2CO3, 2 to 10 percent of sodium humate and 0.5 to 5 percent of disodium ethylenediamine tetraacetate. The two-step scale removing method comprises the steps as follows: the softener for removing the scale is added during the operation of the boiler till the pH value is 10 to 12, the pH value of the water in the boiler is kept for 5 to 7 days under normal waste discharging situation to lead the scale of the boiler to fall off after being softened and dissolved; a corrosion inhibiting hydrochloride cleaning agent bought from market is used for cleaning at normal temperature according to a technique of Chemical Cleaning Rules of Boilers, thereby greatly shortening operation time with good cleaning effect. The scale cleaning time can be shortened to 2 to 3 days from the original 8 to 10 days. The softener for removing the scale has the advantages of innocuity, no harm and no corrosion, and can completely soften and dissolve the scale that is difficult to be removed. The problem that difficult scale of boilers of medium and low voltage power stations can not be cleaned in the prior art. The softener is also applicable to industrial boilers.
Description
Technical field
The present invention relates to a kind of difficult incrustation scale tenderizer, especially a kind of preparation and cleaning and descaling method thereof that is used for the difficult scale descaling of station boiler.
Background technology
Station boiler is meant that with generating and cogeneration be the boiler of main purpose.This class capacity of boiler (t/h) is big, pressure is high, and cost is also high simultaneously, after boiler operatiopn for some time, might tie difficult incrustation scale, must carry out scale removal, otherwise gyp is serious for this reason, will directly cause the boiler booster, and security incident takes place.In addition, gyp also can cause the high problems of production cost such as energy consumption increase, because every knot is given birth to the 1mm incrustation scale, will waste fuel 4%.As: a steam output is the electricity generation boiler of 75t/h, if fouling 1mm is thick, will consume 14.4 tons in coal every day more, just many consumption coals were 432 tons in one month, (calculating by 330 days) just consumed 4752 tons in coals more in 1 year, pressed 350 yuan of/ton calculating of coal price, and just many expenditure fire coals took more than 1,660,000 yuan in 1 year.Therefore, it is very important for safe operation of the boiler in time to remove boiler scale.At present, the feedwater of boiler mostly adopts ion exchange method, ionic membrane facture, electroosmose process, reverse osmosis method etc. to handle, and the most frequently used is ion exchange method.When adopting ion exchange method to handle, for reducing running cost, many users only adopt resin cation (R.C.) to exchange processing, make negatively charged ion contained in the water such as SiO
3 2-, SO
4 2-Deng can not get effective processing, the negatively charged ion that do not fall of processing will generate as CaSiO on boiler surface with the hardness material of remnants like this
3, MgSiO
3, FeSiO
3Etc. siliceous dirt, and as CaSO
4Deng sulfate scale, also have rust deposite and mixed type incrustation scale thereof.This mixed type incrustation scale based on siliceous dirt, sulfate scale generates under High Temperature High Pressure mostly, and therefore dirty matter is hard, adheres to closely, is difficult to remove with existing scale remover and descaling method, so be called difficult incrustation scale.
Show according to pertinent data, chemical process is adopted in the cleaning of station boiler at present mostly, as: EDTA cleans, hydrochloric acid cleans, hydrochloric acid adds hydrofluoric acid clean, nitric acid cleans or the like, when with these methods difficult incrustation scale being cleaned, the effect of its cleaning is also bad, falls flat.The method of Cai Yonging is in addition: use soda boiling earlier after the blowing out, dirt is made the transition, and then clean with hydrochloric acid.But this purging method is because scavenging period is longer, and blowing out influences generating again produces, therefore to the cleaning of the difficult incrustation scale in power station, and still a great problem at present, still more effective solution not.
Summary of the invention
The object of the present invention is to provide a kind of energy to soften boiler fouling, so that the clean the boiler tenderizer that cleans.
Second purpose of the present invention is to provide a kind of method that can carry out cleaning and descaling to the difficult incrustation scale in power station.
First purpose of the present invention is achieved in that the difficult incrustation scale tenderizer of a kind of station boiler, it is characterized in that being made up of the raw material of following mass ratio:
Ethylene diamine tetra methylene phosphonic acid sodium 0.5～7%
Sodium polyacrylate 0.6～8%
Na
3PO
4·12H
2O 10～40％
NaOH 8～35％
Na
2CO
3 15～65％
Sodium salts humic acids 2～10%
Disodium ethylene diamine tetraacetate 0.5～5%.
Described each raw material is technical grade product, and is commercial product.
Described scale removal tenderizer makes by following method: promptly get scale removal tenderizer product after above-mentioned raw materials is fully mixed.
Second purpose of the present invention finished by following technical proposal: cleaning and descaling method of difficult two step of incrustation scale of a kind of station boiler is characterized in that through following process steps:
A, in boiler operatiopn, add following mass ratio the scale removal tenderizer to pH value 10-12, under normal blowdown situation, make feedwater keep this pH value 5-7 days, make the stove dirt softening, come off after dissolving:
Ethylene diamine tetra methylene phosphonic acid sodium 0.5～7%
Sodium polyacrylate 0.6～8%
Na
3PO
4·12H
2O 10～40％
NaOH 8～35％
Na
2CO
3 15～65％
Sodium salts humic acids 2～10%
Disodium ethylene diamine tetraacetate 0.5～5%
After B, the blowing out, adopt conventional inhibition salt acid cleaner, purging method cleans routinely at normal temperatures, gets final product.
The present invention has following advantage and effect: adopt such scheme, make the scale removal tenderizer that obtains have nontoxic, harmless, non-corrosive advantage, and can thoroughly soften, dissolve difficult incrustation scale, when boiler scale being handled with scale removal tenderizer of the present invention, neither influence the normal operation of boiler, also need not blowing out, can make difficult incrustation scale softening, dissolving also has part to come off, its scale removal face is greater than 95%, after blowing out, in 1-2 days with conventional inhibition salt acid cleaner, purging method cleans routinely at normal temperatures, can make boiler recover works better, therefore, thoroughly solve prior art mesolow station boiler and tied the difficult problem that the difficult incrustation scale of becoming suspicious can't obtain removing; Shortened the cleaning furnace outage time, the blowing out scavenging period shortened to 2～3 days by original 8-10 days, had reduced the loss that brings to electrical production because of blowing out; Ensure the safety in production of mesolow station boiler, realized energy-saving and emission-reduction, reduced production cost, make boiler keep most economical operation conditions.Therefore, the present invention is not only energy-conservation, economic worth is considerable, and saves coal-fired, minimizing dusty gas discharging, thereby reduces the pollution to environment.The present invention also is applicable to Industrial Boiler.
The present invention uses in many middle-size and small-size station boilers clean, and through using proof: effect of the present invention is authentic and valid, has obtained user's favorable comment.
Embodiment
Embodiment 1
The large-scale joint venture in Guangzhou, two B﹠amp; The WB35/3.8-M electricity generation boiler, a nineteen ninety-five goes into operation, an operation in 1997, never carried out cleaning since going into operation, knot is given birth to the thick grey black incrustation scale of 1～3mm on the heating surface, is being mingled with the black organism in the dirt, very hard, adhere to closely dirty sample analytical results such as table 1.
The dirty sample analyzing and testing of table 1 result
Can find out that from dirty sample analytical results the incrustation scale of these two lifes that station boiler is tied contains SiO
2Reach more than 36%, be converted into silicate, it is measured greater than 50%, belongs to the difficult incrustation scale of typical silicate, and incrustation scale formed the hornblende crystal mostly, and quality is very hard, is difficult to remove.
Then can effectively remove with the technology of the present invention method, its way is:
The first step, the scale removal tenderizer that adds following mass ratio in boiler operatiopn be to pH=12 ± 0.3, and keep this pH value to make stove water normally move 5～7 days under the blowdown situation, blowing out then, and former incrustation scale transforms, and a part is solution-off:
Ethylene diamine tetra methylene phosphonic acid sodium 0.5kg
Sodium polyacrylate 8kg
Na
3PO
4·12H
2O 10kg
NaOH 35kg
Na
2CO
3 44kg
Sodium salts humic acids 2kg
Disodium ethylene diamine tetraacetate 0.5kg
In second step,, press " boiler matting rule " technology of national regulation at normal temperatures and clean with commercial inhibition salt acid cleaner, operating time shortens greatly, and cleaning performance is good, cleans with the technology of the present invention method, and the cleaning and descaling time can foreshorten to 2～3 days by former 8～10 days.
Embodiment 2
Kunming power plant of Iron And Steel Company HG212-75/3.8 type electricity generation boiler, since going into operation, do not cleaned always, tied on the heating surface and given birth to the thick difficult incrustation scale of 1.5～3mm, through cleaning with the present invention, effect is fine, department inspects for acceptance through survey of boiler, and quality is better than " boiler matting rule " standard-required, is subjected to user's favorable comment (seeing user report, acceptance of materials report).
Concrete grammar is:
The first step, the scale removal tenderizer that adds following mass ratio in boiler operatiopn be to pH=12 ± 0.3, and keep this pH value to make stove water normally move 5～7 days under the blowdown situation, blowing out then, and former incrustation scale transforms, and a part is solution-off:
Ethylene diamine tetra methylene phosphonic acid sodium 1kg
Sodium polyacrylate 4kg
Na
3PO
4·12H
2O 17kg
NaOH 8kg
Na
2CO
3 60kg
Sodium salts humic acids 5kg
Disodium ethylene diamine tetraacetate 5kg
In second step,, clean by " boiler matting rule " technology at normal temperatures with commercial inhibition salt acid cleaner, operating time shortens greatly, and cleaning performance is good, cleans with the technology of the present invention method, and the cleaning and descaling time can foreshorten to 2～3 days by former 8～10 days.
Embodiment 3
Get material by following prescription:
Ethylene diamine tetra methylene phosphonic acid sodium 5kg
Sodium polyacrylate 3kg
Na
3PO
4·12H
2O 40kg
NaOH 15kg
Na
2CO
3 29kg
Sodium salts humic acids 5kg
Disodium ethylene diamine tetraacetate 3kg
Behind the abundant mixing of above-mentioned raw materials, promptly get scale removal tenderizer product.
Embodiment 4
Get material by following prescription:
Ethylene diamine tetra methylene phosphonic acid sodium 2kg
Sodium polyacrylate 3kg
Na
3PO
4·12H
2O 10kg
NaOH 10kg
Na
2CO
3 65kg
Sodium salts humic acids 8kg
Disodium ethylene diamine tetraacetate 2kg
Behind the abundant mixing of above-mentioned raw materials, promptly get scale removal tenderizer product.
Embodiment 5
Get material by following prescription:
Ethylene diamine tetra methylene phosphonic acid sodium 7kg
Sodium polyacrylate 0.6kg
Na
3PO
4·12H
2O 30kg
NaOH 20kg
Na
2CO
3 35kg
Sodium salts humic acids 6kg
Disodium ethylene diamine tetraacetate 1.4kg
Behind the abundant mixing of above-mentioned raw materials, promptly get scale removal tenderizer product.
Claims (2)
1, the difficult incrustation scale tenderizer of a kind of station boiler is characterized in that being made up of the raw material of following mass ratio:
Ethylene diamine tetra methylene phosphonic acid sodium 0.5～7%
Sodium polyacrylate 0.6～8%
Na
3PO
4·12H
2O 10～40％
NaOH 8～35％
Na
2CO
3 15～65％
Sodium salts humic acids 2～10%
Disodium ethylene diamine tetraacetate 0.5～5%.
2, cleaning and descaling method of difficult two step of incrustation scale of a kind of station boiler is characterized in that through following process steps:
A, in boiler operatiopn, add following mass ratio the scale removal tenderizer to pH value 10-12, under normal blowdown situation, make feedwater keep this pH value 5-7 days, make the stove dirt softening, come off after dissolving:
Ethylene diamine tetra methylene phosphonic acid sodium 0.5～7%
Sodium polyacrylate 0.6～8%
Na
3PO
4·12H
2O 10～40％
NaOH 8～35％
Na
2CO
3 15～65％
Sodium salts humic acids 2～10%
Disodium ethylene diamine tetraacetate 0.5～5%
After B, the blowing out, adopt conventional inhibition salt acid cleaner, purging method cleans routinely at normal temperatures, gets final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810058390A CN100588625C (en) | 2008-05-15 | 2008-05-15 | Softener for station boiler sediment incrustation and two-stage incrustation-removing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810058390A CN100588625C (en) | 2008-05-15 | 2008-05-15 | Softener for station boiler sediment incrustation and two-stage incrustation-removing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101274803A true CN101274803A (en) | 2008-10-01 |
| CN100588625C CN100588625C (en) | 2010-02-10 |
Family
ID=39994718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810058390A Expired - Fee Related CN100588625C (en) | 2008-05-15 | 2008-05-15 | Softener for station boiler sediment incrustation and two-stage incrustation-removing method |
Country Status (1)
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|---|---|
| CN (1) | CN100588625C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913713A (en) * | 2010-03-16 | 2010-12-15 | 上海立昌环境工程有限公司 | Sulfate scale cleaning agent |
| 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 |
| CN104925965A (en) * | 2015-06-24 | 2015-09-23 | 周彩球 | Special softener for recycling water |
| CN105502693A (en) * | 2014-09-25 | 2016-04-20 | 武汉凌科达科技有限公司 | Preparation method of novel boiler scale remover |
| CN111484905A (en) * | 2019-12-21 | 2020-08-04 | 合肥皖化电泵有限公司 | Furnace water pump inner cavity cleaning additive solution and use method thereof |
| CN111620449A (en) * | 2020-07-07 | 2020-09-04 | 北京尤洁科技有限公司 | Phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent |
| CN113432106A (en) * | 2021-06-30 | 2021-09-24 | 新疆百建安环保科技有限责任公司 | Cleaning and descaling agent and online cleaning process for high-pressure steam injection boiler of oil field |
| CN114715993A (en) * | 2021-11-30 | 2022-07-08 | 杨兴富 | Boiler operation water coordination treatment agent |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1013359B (en) * | 1986-07-17 | 1991-07-31 | 鞍钢矿山公司房产福利处 | Method of removing boiler scales |
| CN1351105A (en) * | 2000-10-30 | 2002-05-29 | 中国人民解放军海军工程大学 | Corrosion inhibitor for cooling liquid of IC engine |
| CN1167634C (en) * | 2001-11-21 | 2004-09-22 | 穆青春 | Boiler scale preventing and eliminating agent |
| CN1491908A (en) * | 2003-08-20 | 2004-04-28 | 东营联通化工有限责任公司 | Barium-strontium scale resistant agent |
-
2008
- 2008-05-15 CN CN200810058390A patent/CN100588625C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913713A (en) * | 2010-03-16 | 2010-12-15 | 上海立昌环境工程有限公司 | Sulfate scale cleaning agent |
| CN101913713B (en) * | 2010-03-16 | 2012-02-29 | 上海立昌环境工程有限公司 | Sulfate scale cleaning agent |
| CN105502693A (en) * | 2014-09-25 | 2016-04-20 | 武汉凌科达科技有限公司 | Preparation method of novel boiler scale remover |
| 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 |
| CN104925965A (en) * | 2015-06-24 | 2015-09-23 | 周彩球 | Special softener for recycling water |
| CN111484905A (en) * | 2019-12-21 | 2020-08-04 | 合肥皖化电泵有限公司 | Furnace water pump inner cavity cleaning additive solution and use method thereof |
| CN111620449A (en) * | 2020-07-07 | 2020-09-04 | 北京尤洁科技有限公司 | Phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent |
| CN113432106A (en) * | 2021-06-30 | 2021-09-24 | 新疆百建安环保科技有限责任公司 | Cleaning and descaling agent and online cleaning process for high-pressure steam injection boiler of oil field |
| CN114715993A (en) * | 2021-11-30 | 2022-07-08 | 杨兴富 | Boiler operation water coordination treatment agent |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100588625C (en) | 2010-02-10 |
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Granted publication date: 20100210 Termination date: 20180515 |