CN1254443C - Scale and corrosion inhibiting method for industrial boiler - Google Patents
Scale and corrosion inhibiting method for industrial boiler Download PDFInfo
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- CN1254443C CN1254443C CN 200310101609 CN200310101609A CN1254443C CN 1254443 C CN1254443 C CN 1254443C CN 200310101609 CN200310101609 CN 200310101609 CN 200310101609 A CN200310101609 A CN 200310101609A CN 1254443 C CN1254443 C CN 1254443C
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Abstract
The present invention relates to a scale and corrosion prevention method for industrial boilers. Sodium sulfite and isoascorbic acid are prepared into stable sodium sulfite in advance, and polyepoxy succinic acid is added into a boiler system. Then, the stable sodium sulfite is added into the boiler system, and besides, the content of the sodium sulfite in the system maintains between 2 mg/L and 10 mg/L. Thus, a green scale inhibitor and a green oxygen remover exert stable synergistic effect in the high-pressure, high-temperature and high-alkali boiler system. The method has the advantages of environment protection and high efficiency.
Description
Technical field
The present invention relates to a kind of anti-corrosion, scale-inhibiting method of Industrial Boiler, particularly use the anti-corrosion, scale-inhibiting method of scale inhibition, oxygen scavenger.
Background technology
To low pressure boiler, generally the method for scale inhibition of Cai Yonging is softening-Scale inhibitors method and Scale inhibitors method, and generally the anti-corrosion method of Cai Yonging is deoxygenator-oxygen scavenger method and oxygen scavenger method.Adopt at present the Scale inhibitors kind mainly contain phosphoric acid salt, poly-phosphate, organic multicomponent phosphonic acids, polyacrylic acid, styrene sulfonic acid and maleic acid etc., these Scale inhibitorss have scale effect preferably, but can cause environmental problem, thereby its discharging is restricted.More important oxygen scavenger has sulphite, hydrazine, diethyl azanol, carbohydrazide, quinhydrones, amido guanidine, methyl ethyl ketone oxime etc., wherein sulphite non-toxic inexpensive but easy oxidation deactivation, and effects such as hydrazine are better but exist toxicity problem.
The green scale inhibitor of having found so far only has two kinds of poly-epoxy succinic acid (PESA) and poly aspartic acids.Wherein, PESA is a kind of water-soluble polymers with powerful chelating and scale inhibition performance, and not phosphorous in its molecular structure, nitrogen element can not cause body eutrophication, and biodegradable is good.
U.S. Pat 5,248,438 (BetzDearborn Inc., 1993) and U.S. Pat 5,342,540 (1994) provide the method for scale inhibition that adds poly-epoxy succinic acid, acrylic copolymer and lanthanide ion in water coolant, when poly-epoxy succinic acid and acrylic copolymer are united when using, the scale-inhibiting properties of poly-epoxy succinic acid can descend significantly, and this patent has stoped the interaction of poly-epoxy succinic acid and acrylic copolymer effectively with lanthanide ion.U.S. Pat 5,562,830 (1996) have invented a kind of method that poly-epoxy succinic acid and phosphine carboxylic acid come scale inhibition and inhibition that adds in water coolant.U.S. Pat 5,866,011 (1999,2,2) provide a kind of and prevented that with PESA salt from concentrating and the method for scale inhibition of vapo(u)rization system fouling, in the above patent, PESA all is operated in normal pressure, temperature is not high, low basicity, under low pH value and the sufficient condition of water quality of oxygen supply, and boiler systems is in high pressure, high temperature, high basicity, under the condition of water quality of high pH value and anoxic or anaerobic, the general polymerization thing can lose efficacy with this understanding, whether this green polymer of PESA can effectively prevent the fouling of boiler heat-transfer face with this understanding, and whether has synergy between it and the oxygen scavenger, does not still have bibliographical information so far.Therefore, still be not applicable at present the environmental friendly, anti-corrosive method of scale inhibition that the green scale of boiler systems cooperates with sanitas.
Summary of the invention
The invention solves in the boiler systems of high pressure, high temperature and high basicity, use the problem of oxidation of poly-epoxy succinic acid and sulphite, the synergy that these two kinds of green scale inhibitors and oxygen scavenger are played stably, thus a kind of environmental friendliness, environment-friendly boiler anti-corrosion, scale-inhibiting method efficiently are provided.
Main technical schemes: the present invention is with poly-epoxy succinic acid, saccharosonic acid (IV
C) and the synergistic effect of sulphite be the boiler anti-corrosion method of scale inhibition of feature.In advance with S-WAT and saccharosonic acid (IV
C) mix, make stable S-WAT, IV
CConsumption be generally 1%～5% of S-WAT quality, the poly-epoxy succinic acid of 1mg/L-50mg/L is joined in the boiler systems, and then will stablize S-WAT and add in the boiler systems, and the amount that keeps system's Central Asia sodium sulfate is between 2mg/L-10mg/L.
Poly-epoxy succinic acid of the present invention can adopt commercially available industrial goods, and its relative molecular mass is 400～1000, and best amount ranges is difficult to effectively prevent fouling when very few between 2mg/L-20mg/L, causes waste in the time of too much.Sulphite of the present invention generally is commercially available S-WAT, saccharosonic acid (IV
C) can adopt commercially available industrial goods.IV
CMain effect be to stablize S-WAT, prevent that S-WAT from entering the oxidation deactivation before the boiler.
The present invention all has the efficient corrosion resisting scale effect to the hardness of oiler feed and basicity without limits under ortho-water, high hardness, high-alkali water condition.The present invention to the quality of pot water without limits, the boiler pressure scope that the present invention is suitable for is normal pressure～2.45MPa.
The invention effect: the present invention is in the boiler systems of high pressure, high temperature and high basicity, use poly-epoxy succinic acid, and solved the problem of oxidation of sulphite, make it and the stable synergy of poly-epoxy succinic acid, thereby a kind of without phosphorus, non-nitrogen, readily biodegradable, eco-friendly boiler anti-corrosion method of scale inhibition are provided.This anti-corrosion, scale-inhibiting method is strong to the adaptability of temperature, pressure, water quality, in pot water pH value is 10～12, under the standard water quality of total dissolved solid≤4000mg/L, even under the hyperconcentration water quality of total dissolved solid 15000mg/L, still have the efficient corrosion resisting scale effect.Scale inhibition performance to boiler can reach 100%, and corrosion inhibition rate can reach 99%.
Embodiment
Embodiment
Example 1: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.56%.
Example 2: with S-WAT and IV
CMass ratio by 100: 1 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.12%.
Example 3: with S-WAT and IV
CMass ratio by 100: 5 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.89%.
Example 4: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 1mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.Check that the boiler heat-transfer face is not found fouling and corrosion after operation in 4 months, the scale inhibition performance of standard 20g steel test piece is 98.23%, and corrosion inhibition rate is 99.56%.
Example 5: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 50mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.91%.
Example 6: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 2mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 95.32%.
Example 7: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 10mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.95%.
Example 8: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is normal pressure, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.10%.
Example 9: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 0.69MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.46%.
Example 10: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 2.45MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 18mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.65%.
Example 11: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 1000mg/L, the ordinary tap water of basicity 250mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.31%.
Example 12: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feeds water to be hardness 250mg/L, the ordinary tap water of basicity 1000mg/L, pot water pH value is 10～12, in the operation steam boiler system of total dissolved solid≤4000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.After operation in 4 months, check that the boiler heat-transfer face is not found fouling and corrosion, the obviously attenuation of original dirt layer, part surface is clean, and the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.28%.
Example 13: with S-WAT and IV
CMass ratio by 100: 3 mixes, and makes IV
CStablize S-WAT.To an operating pressure is 1.27MPa, feedwater is hardness 250mg/L, the ordinary tap water of basicity 250mg/L, pot water is pH value 10～12, in the operation steam boiler system of the test water quality of total dissolved solid 15000mg/L, the adding relative molecular mass is 400～1000 PESA 5mg/L, adds IV again
CStablize S-WAT, the S-WAT content in pot water is remained on about 5mg/L.Check that after test run in 1 month the boiler heat-transfer face is not found fouling, the scale inhibition performance of standard 20g steel test piece is 100%, and corrosion inhibition rate is 99.16%.
Claims (3)
1, a kind of Industrial Boiler anti-corrosion, scale-inhibiting method, in boiler systems, add Scale inhibitors and oxygen scavenger, it is characterized in that: Scale inhibitors is a poly-epoxy succinic acid, oxygen scavenger is for stablizing S-WAT, add and fashionablely in advance S-WAT and saccharosonic acid are mixed, make stable S-WAT, the consumption of saccharosonic acid is 1%～5% of a S-WAT quality, the poly-epoxy succinic acid of 1mg/L-50mg/L is joined in the boiler systems, and then will stablize in the S-WAT adding boiler systems, and the amount of maintenance system Central Asia sodium sulfate is between 2mg/L-10mg/L.
2, anti-corrosion, scale-inhibiting method according to claim 1 is characterized in that: the relative molecular mass of poly-epoxy succinic acid is 400～1000.
3, anti-corrosion, scale-inhibiting method according to claim 1 is characterized in that, the poly-epoxy succinic acid consumption is between 2mg/L-20g/L.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310101609 CN1254443C (en) | 2003-10-22 | 2003-10-22 | Scale and corrosion inhibiting method for industrial boiler |
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|---|---|---|---|
| CN 200310101609 CN1254443C (en) | 2003-10-22 | 2003-10-22 | Scale and corrosion inhibiting method for industrial boiler |
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| CN1609019A CN1609019A (en) | 2005-04-27 |
| CN1254443C true CN1254443C (en) | 2006-05-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103359838B (en) * | 2012-04-10 | 2014-09-10 | 上海依科绿色工程有限公司 | High-performance compound corrosion-inhibiting and anti-scaling agent containing galvanized material in closed high-temperature hot water system as well as preparation and application of high-performance compound corrosion-inhibiting and anti-scaling agent |
| CN103130359A (en) * | 2013-03-21 | 2013-06-05 | 柳州市盛鹏源环保科技有限公司 | Corrosion and scale inhibition method for soft water closed circulation system |
| CN103555477B (en) * | 2013-11-06 | 2016-05-18 | 李继水 | A kind of pipeline cleaning agent and preparation and cleaning method |
| FI125111B (en) * | 2013-11-19 | 2015-06-15 | Kemira Oyj | A method for analyzing a sample comprising first and second anticaking agents |
| CN109292876A (en) * | 2018-11-13 | 2019-02-01 | 中盐安徽红四方股份有限公司 | Boiler water oxygen regulator |
| CN113044998B (en) * | 2021-03-26 | 2022-08-26 | 四川鸿康科技股份有限公司 | Boiler water supply agent and preparation method and application thereof |
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