CN102747376A - Cleaning method of simple substance copper scales - Google Patents
Cleaning method of simple substance copper scales Download PDFInfo
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- CN102747376A CN102747376A CN2012102409324A CN201210240932A CN102747376A CN 102747376 A CN102747376 A CN 102747376A CN 2012102409324 A CN2012102409324 A CN 2012102409324A CN 201210240932 A CN201210240932 A CN 201210240932A CN 102747376 A CN102747376 A CN 102747376A
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Abstract
The invention relates to a cleaning method of simple substance copper scales, belonging to the field of chemical cleaning of boilers in fuel electric plants. The method comprises the following steps: (1) primary copper removal; (2) primary acid cleaning; (3) secondary copper removal; (4) secondary acid cleaning; and (5) tertiary cleaning, wherein the reagent raw materials used in the steps are metered in percentage by mass. The invention thoroughly solves the problem of simple substance copper scale removal. By using the method, the scale removal rate is up to more than 99%; and the invention ensures the safety in production, and does not have hidden danger.
Description
Technical field
The invention belongs to heat power plant boiler matting field.
Background technology
Stipulate according to " heat power plant boiler matting guide rule " DL/T794-2001: the drum boiler that has put into operation, if the content of cupric oxide is higher in the dirt, the considered copper removal, can take following method to carry out:
1) ammonia eccysis copper: HCl uses NH after cleaning
3H
2O 1.3% ~ 1.5% and (NH
4)
2S
2O
80.5% cleans.
2) hydrochloric acid cleans the thiocarbamide single stage method: HCl 4% ~ 7%+ (NH
2)
2CS 0.5%+NaF0.5%～0.6%.
3) subacidity copper removal: after the flushing of chlorohydric acid pickling water is qualified, H
3C
6H
5O
70.2% ~ 0.3%+0.05% inhibiter+NaNO
21.0% ~ 2.0%.
4) one step of scale removal passivation is mixed cleaning: phosphoric acid is that main multiple inorganic, organic chemistry medicament matees by a certain percentage.
But find in the practice that the method for using sometimes among the DL/T794-2001 is cleaned and all do not obtained good effect, particularly to the warm oneself in front of a fire side of deposition on the water wall tube up to 16.7% copper, its dirt amount reaches 500g/m
2Making an experiment in the laboratory by the method among the above-mentioned DL/T794-2001 does not all have good effect; And clean the back and find that there is the existence of elemental copper on pipe appearance surface, have a strong impact on the safety of unit, after certain 670t/h of factory boiler adopts aforesaid method to clean; Move 72 hours large-area pipe explosion accident has just taken place, the compelled secondary cleaning of carrying out.Show that present descaling method can not satisfy the needs in the production.
Summary of the invention
The present invention provides a kind of purging method of elemental copper dirt, removes the bad problem of copper dirt effect to solve present descaling method.
The technical scheme that the present invention takes is: comprise the following steps that used medicament stock is all in massfraction in each step:
(1), copper removal for the first time, mix back, cleaning 3 ~ 5 hours with following medicament stock,
Water: 96 ~ 98 parts;
Ammonium persulphate: 1.0 ~ 2.0 parts;
Sodium hexametaphosphate 99: 0.2 ~ 0.5 part;
Sodium Fluoride: 0.1 ~ 0.3 part;
(2), pickling for the first time, after following medicament stock mixing, cleaned 7 ~ 9 hours; The water flushing is 1 ~ 3 hour again;
Water: 95 ~ 96 parts;
36% ~ 38% hydrochloric acid, 1.18g/ml ~ 1.19 g/ml:4 ~ 5 part;
IS156 inhibiter: 0.2 ~ 0.3 part;
(3), copper removal for the second time, after following medicament stock mixing, cleaned 1 ~ 3 hour;
Water: 98 ~ 99 parts;
Ammonium persulphate: 0.2 ~ 0.5 part;
25% ~ 28% ammoniacal liquor, ρ are 0.88 g/ml ~ 0.90g/ml:0.5 ~ 1.0 part;
Sodium hexametaphosphate 99: 0.1 ~ 0.3 part;
Sodium Fluoride: 0.1 ~ 0.3 part;
(4), pickling for the second time, after following medicament stock mixing, cleaned 2 ~ 4 hours; The water flushing is 1 ~ 3 hour again;
Water: 97 ~ 98 parts;
36% ~ 38% hydrochloric acid, ρ are 1.18g/ml ~ 1.19 g/ml:2 ~ 3 part;
IS156 inhibiter: 0.2 ~ 0.3 part;
(5), for the third time clean, after following medicament stock mixing, cleaned 1 ~ 3 hour; The water flushing is 1 ~ 2 hour again:
Water: 97 ~ 99 parts;
36% ~ 38% hydrochloric acid, ρ are 1.18g/ml ~ 1.19 g/ml:1 ~ 2 part;
IS156 inhibiter: 0.1 ~ 0.2 part;
Thiocarbamide: 0.1 ~ 0.3 part.
The inventor finds that in practice copper content is higher in dirt, and copper is with elemental copper but not cupric oxide form when existing, because copper content is up to more than 16% in the hard scale, the dirt amount is up to 500g/m
2More than, method is cleaned and is not all obtained good effect among the application DL/T794-2001.
The present invention has broken the mode of a copper removal+pickling of traditional technology, has adopted with oxygenant ammonium persulphate, auxiliary agent Sodium Fluoride and sodium hexametaphosphate dispersant the elemental copper oxidation, adopts repeatedly the oxidation copper removal to add the mode of pickling, and dirt is peeled off layer by layer.According to the removal situation of dirt, change the drug parameter of kenel control pickling, thoroughly solved elemental copper dirt removal problem.The total add-on of ammonium persulphate is in 2 times of copper content, and this kind method descaling rate reaches more than 99%, does not have hidden danger.Remedy copper removal of traditional technology and added the deficiency that the pickling mode is removed high-content copper.
The present invention is applied to No. 4 units of Huijiang power plant, and copper content is taken a sample to check through on-the-spot pipe cutting up to 17.8%, descaling rate 100%, and the erosion rate of corrosion indicator is 1.8g/m
2H is less than the 8g/m of standard-required
2H reaches standard-required fully, is cited as high grade project.The invention has the beneficial effects as follows: thoroughly solved elemental copper dirt removal problem.This kind method descaling rate reaches more than 99%, guarantees safety in production, does not deposit hidden danger.
Embodiment
Embodiment 1
Used medicament stock is all in massfraction in each step:
(1), copper removal for the first time, mix back, cleaning 3 hours with following medicament stock,
Water: 96kg;
Ammonium persulphate: 1.0kg;
Sodium hexametaphosphate 99: 0.2kg;
Sodium Fluoride: 0.1kg;
(2), pickling for the first time, after following medicament stock mixing, cleaned 7 hours; The water flushing is 1 hour again;
Water: 95kg;
36% hydrochloric acid, ρ are 1.18g/ml:4kg;
IS156 inhibiter: 0.2kg;
(3), copper removal for the second time, after following medicament stock mixing, cleaned 1 hour;
Water: 98kg;
Ammonium persulphate: 0.2kg;
25% ammoniacal liquor, ρ are 0.90g/ml:0.5kg;
Sodium hexametaphosphate 99: 0.1kg;
Sodium Fluoride: 0.1kg;
(4), pickling for the second time, after following medicament stock mixing, cleaned 2 hours; The water flushing is 1 hour again;
Water: 97kg;
36% hydrochloric acid ρ is 1.18g/ml: 2kg;
IS156 inhibiter: 0.2kg;
(5), for the third time clean, after following medicament stock mixing, cleaned 1 hour; The water flushing is 1 hour again:
Water: 97kg;
36% hydrochloric acid, ρ are 1.18g/ml:1kg;
IS156 inhibiter: 0.1kg;
Thiocarbamide: 0.1kg.
Embodiment 2
Used medicament stock is all in massfraction in each step:
(1), copper removal for the first time, mix back, cleaning 4 hours with following medicament stock,
Water: 97kg;
Ammonium persulphate: 1.5kg;
Sodium hexametaphosphate 99: 0.35kg;
Sodium Fluoride: 0.2kg;
(2), pickling for the first time, after following medicament stock mixing, cleaned 8 hours; The water flushing is 2 hours again;
Water: 95.5kg;
37% hydrochloric acid, ρ are 1.18g/ml:4.5kg;
IS156 inhibiter: 0.25kg;
(3), copper removal for the second time, after following medicament stock mixing, cleaned 2 hours;
Water: 98.5kg;
Ammonium persulphate: 0.35kg;
27% ammoniacal liquor, ρ are 0.88g/ml:0.75kg;
Sodium hexametaphosphate 99: 0.2kg;
Sodium Fluoride: 0.2kg;
(4), pickling for the second time, after following medicament stock mixing, cleaned 3 hours; The water flushing is 2 hours again;
Water: 97.5kg;
37% hydrochloric acid, ρ are 1.18g/ml:2.5kg;
IS156 inhibiter: 0.25kg;
(5), for the third time clean, after following medicament stock mixing, cleaned 2 hours; The water flushing is 1.5 hours again:
Water: 98kg;
37% hydrochloric acid, ρ are 1.18g/ml:1.5kg;
IS156 inhibiter: 0.15kg;
Thiocarbamide: 0.2kg.
Embodiment 3
Used medicament stock is all in massfraction in each step:
(1), copper removal for the first time, mix back, cleaning 5 hours with following medicament stock,
Water: 98kg;
Ammonium persulphate: 2.0kg;
Sodium hexametaphosphate 99: 0.5kg;
Sodium Fluoride: 0.3kg;
(2), pickling for the first time, after following medicament stock mixing, cleaned 9 hours; The water flushing is 3 hours again;
Water: 96kg;
38% hydrochloric acid, ρ are 1.19 g/ml:5kg;
IS156 inhibiter: 0.3kg;
(3), copper removal for the second time, after following medicament stock mixing, cleaned 3 hours;
Water: 99kg;
Ammonium persulphate: 0.5kg;
28% ammoniacal liquor, ρ are 0.88 g/ml:1.0kg;
Sodium hexametaphosphate 99: 0.3kg;
Sodium Fluoride: 0.3kg;
(4), pickling for the second time, after following medicament stock mixing, cleaned 4 hours; The water flushing is 3 hours again;
Water: 98kg;
38% hydrochloric acid, ρ are 1.19 g/ml:3kg;
IS156 inhibiter: 0.3kg;
(5), for the third time clean, after following medicament stock mixing, cleaned 3 hours; The water flushing is 2 hours again:
Water: 99kg;
38% hydrochloric acid, ρ are 1.19 g/ml:2kg;
IS156 inhibiter: 0.2kg;
Thiocarbamide: 0.3kg.
Claims (2)
1. the purging method of elemental copper dirt is characterized in that comprising the following steps that used medicament stock is all in massfraction in each step:
(1), copper removal for the first time, mix back, cleaning 3 ~ 5 hours with following medicament stock,
Water: 96 ~ 98 parts;
Ammonium persulphate: 1.0 ~ 2.0 parts;
Sodium hexametaphosphate 99: 0.2 ~ 0.5 part;
Sodium Fluoride: 0.1 ~ 0.3 part;
(2), pickling for the first time, after following medicament stock mixing, cleaned 7 ~ 9 hours; The water flushing is 1 ~ 3 hour again;
Water: 95 ~ 96 parts;
36% ~ 38% hydrochloric acid, 1.18g/ml ~ 1.19 g/ml:4 ~ 5 part;
IS156 inhibiter: 0.2 ~ 0.3 part;
(3), copper removal for the second time, after following medicament stock mixing, cleaned 1 ~ 3 hour;
Water: 98 ~ 99 parts;
Ammonium persulphate: 0.2 ~ 0.5 part;
25% ~ 28% ammoniacal liquor, ρ are 0.88 g/ml ~ 0.90g/ml:0.5 ~ 1.0 part;
Sodium hexametaphosphate 99: 0.1 ~ 0.3 part;
Sodium Fluoride: 0.1 ~ 0.3 part;
(4), pickling for the second time, after following medicament stock mixing, cleaned 2 ~ 4 hours; The water flushing is 1 ~ 3 hour again;
Water: 97 ~ 98 parts;
36% ~ 38% hydrochloric acid, ρ are 1.18g/ml ~ 1.19 g/ml:2 ~ 3 part;
IS156 inhibiter: 0.2 ~ 0.3 part;
(5), for the third time clean, after following medicament stock mixing, cleaned 1 ~ 3 hour; The water flushing is 1 ~ 2 hour again:
Water: 97 ~ 99 parts;
36% ~ 38% hydrochloric acid, ρ are 1.18g/ml ~ 1.19 g/ml:1 ~ 2 part;
IS156 inhibiter: 0.1 ~ 0.2 part;
Thiocarbamide: 0.1 ~ 0.3 part.
2. the purging method of elemental copper dirt according to claim 1 is characterized in that comprising the following steps that used medicament stock is all in massfraction in each step:
(1), copper removal for the first time, mix back, cleaning 4 hours with following medicament stock,
Water: 97 parts;
Ammonium persulphate: 1.5 parts;
Sodium hexametaphosphate 99: 0.35 part;
Sodium Fluoride: 0.2 part;
(2), pickling for the first time, after following medicament stock mixing, cleaned 8 hours; The water flushing is 2 hours again;
Water: 95.5 parts;
37% hydrochloric acid, ρ are 1.18g/ml:4.5 part;
IS156 inhibiter: 0.25 part;
(3), copper removal for the second time, after following medicament stock mixing, cleaned 2 hours;
Water: 98.5 parts;
Ammonium persulphate: 0.35 part;
27% ammoniacal liquor, ρ are 0.88g/ml:0.75 part;
Sodium hexametaphosphate 99: 0.2 part;
Sodium Fluoride: 0.2 part;
(4), pickling for the second time, after following medicament stock mixing, cleaned 3 hours; The water flushing is 2 hours again;
Water: 97.5 parts;
37% hydrochloric acid, ρ are 1.18g/ml:2.5 part;
IS156 inhibiter: 0.25 part;
(5), for the third time clean, after following medicament stock mixing, cleaned 2 hours; The water flushing is 1.5 hours again:
Water: 98 parts;
37% hydrochloric acid, ρ are 1.18g/ml:1.5 part;
IS156 inhibiter: 0.15 part;
Thiocarbamide: 0.2 part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210240932 CN102747376B (en) | 2012-07-12 | 2012-07-12 | Cleaning method of simple substance copper scales |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210240932 CN102747376B (en) | 2012-07-12 | 2012-07-12 | Cleaning method of simple substance copper scales |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102747376A true CN102747376A (en) | 2012-10-24 |
| CN102747376B CN102747376B (en) | 2013-07-17 |
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|---|---|---|---|
| CN 201210240932 Active CN102747376B (en) | 2012-07-12 | 2012-07-12 | Cleaning method of simple substance copper scales |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047004A (en) * | 2014-06-23 | 2014-09-17 | 梧州恒声电子科技有限公司 | Reagent for removing oxide scale on surface of copper and preparation method thereof |
| CN104482526A (en) * | 2014-11-28 | 2015-04-01 | 徐春 | Processing unit for boiler cleaning connector of supercritical unit and cleaning process thereof |
| 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 |
| 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 |
-
2012
- 2012-07-12 CN CN 201210240932 patent/CN102747376B/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 宋叶林: "《锅炉清洗实用技术（文本书）》", 30 September 2003 * |
| 马文静等: "高含量硅酸盐及铜垢的清洗方法", 《吉林电力》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104047004A (en) * | 2014-06-23 | 2014-09-17 | 梧州恒声电子科技有限公司 | Reagent for removing oxide scale on surface of copper and preparation method thereof |
| CN104482526A (en) * | 2014-11-28 | 2015-04-01 | 徐春 | Processing unit for boiler cleaning connector of supercritical unit and cleaning process thereof |
| CN104482526B (en) * | 2014-11-28 | 2016-08-17 | 徐春 | A kind of supercritical boiler cleans interface processing device and cleaning thereof |
| 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 |
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|---|---|
| CN102747376B (en) | 2013-07-17 |
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