CN114180730A - High-concentration multiple corrosion and scale inhibitor for circulating cooling water system and water treatment method - Google Patents
High-concentration multiple corrosion and scale inhibitor for circulating cooling water system and water treatment method Download PDFInfo
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- CN114180730A CN114180730A CN202111375148.XA CN202111375148A CN114180730A CN 114180730 A CN114180730 A CN 114180730A CN 202111375148 A CN202111375148 A CN 202111375148A CN 114180730 A CN114180730 A CN 114180730A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 50
- 238000005260 corrosion Methods 0.000 title claims abstract description 42
- 230000007797 corrosion Effects 0.000 title claims abstract description 42
- 239000000498 cooling water Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 16
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims abstract description 35
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000004021 humic acid Substances 0.000 claims abstract description 35
- 239000000178 monomer Substances 0.000 claims abstract description 31
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 229920000141 poly(maleic anhydride) Polymers 0.000 claims abstract description 10
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 10
- 239000004094 surface-active agent Substances 0.000 claims abstract description 10
- 150000003751 zinc Chemical class 0.000 claims abstract description 10
- 238000005886 esterification reaction Methods 0.000 claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 5
- 239000003054 catalyst Substances 0.000 claims abstract description 5
- 230000032050 esterification Effects 0.000 claims abstract description 5
- 239000003999 initiator Substances 0.000 claims abstract description 5
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000003112 inhibitor Substances 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- -1 hydroxypropyl Chemical group 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 claims description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 150000003254 radicals Chemical class 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims 4
- 230000005764 inhibitory process Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 10
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract description 2
- 230000003301 hydrolyzing effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000004913 activation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000003381 solubilizing effect Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/105—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances combined with inorganic substances
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention relates to a high-concentration multiple corrosion and scale inhibitor for a circulating cooling water system, which comprises the following raw material components in parts by weight: hydrolyzing polymaleic anhydride, zinc salt, hydroxyl-containing acrylic monomer, humic acid, surfactant and water; in the preparation of the slow-release scale inhibitor, hydroxyl-containing acrylic monomers and acrylic monomers are used as raw materials, under the action of a catalyst and an initiator, hydroxyl-containing polyacrylate is synthesized through polymerization and esterification of free radicals, humic acid is added in the reaction process for common reaction, and then the corrosion and scale inhibitor is mixed with the rest raw materials to prepare the corrosion and scale inhibitor. According to the invention, hydroxyl-containing acrylic monomers and acrylic monomers are used as raw materials, humic acid is added in the reaction process, and a mixed product containing hydroxyl polyacrylate, humic acid and polyacrylate-humic acid esterification is obtained through polymerization esterification, wherein the molecular structure of the mixed product contains a large amount of hydroxyl and carboxyl, a straight chain and a branched chain alternately extend, the molecular weight can be regulated and controlled through formula design, and the corrosion and scale inhibition effects of the scale inhibitor are enhanced.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a high-concentration multiple corrosion and scale inhibitor for a circulating cooling water system and a water treatment method.
Background
The industrial cooling water is saved, the limited water resource is utilized to the maximum extent, and the method is the important factor of water saving work in the industrial field. The technology of adopting circulating cooling water is a main method for saving water in the industrial field.
The concentration multiple is an important technical index for judging the running state of the system. The concentration multiple of the circulating cooling water is increased, so that the supplementary water quantity and the sewage discharge quantity can be greatly reduced, the water saving effect is very obvious, and the economic benefit and the social benefit are obvious. The concentration multiple of the system is improved, no equipment is required to be added, the ion concentration in the cooling water is improved, the scaling tendency and the corrosion tendency are greatly increased, and the traditional treatment scheme cannot adapt to the situation due to the limitation of medicament stability and scaling inhibition capacity.
Make-up water is low hardness high alkalinity quality of water, and has higher content corrosive ion in the water, along with the improvement of system temperature, concentration multiple, the scale deposit trend will be more and more serious to a certain extent, and in addition the corruption will receive the influence of anti-scaling effect to a certain extent, especially under the not good condition of anti-scaling effect, easily produces under-scale corrosion to the system.
Therefore, a scale inhibitor medicament with good stability and high scale inhibition capability is needed to be suitable for makeup water with high concentration multiple, and in addition, the concentration multiple cannot be simply improved by adding the scale inhibitor medicament due to different system makeup water quality conditions of different enterprises in different regions, so that matched control needs to be carried out under the known condition of makeup water quality, scale is strictly controlled, and simultaneously, the corrosion inhibition effect is considered.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a highly concentrated multiple corrosion and scale inhibitor for a circulating cooling water system.
The invention is realized by adopting the following technical scheme:
a high-concentration multiple corrosion and scale inhibitor for a circulating cooling water system comprises the following raw material components in parts by weight: 5-10 parts of hydrolyzed polymaleic anhydride, 5-8 parts of zinc salt, 12-25 parts of hydroxyl-containing acrylic monomer, 12-25 parts of acrylic monomer, 20-40 parts of humic acid, 4-8 parts of surfactant and 10-30 parts of water;
in the preparation of the slow-release scale inhibitor, hydroxyl-containing acrylic monomers and acrylic monomers are used as raw materials, under the action of a catalyst and an initiator, hydroxyl-containing polyacrylate is synthesized through polymerization and esterification of free radicals, humic acid is added in the reaction process for common reaction, and then the corrosion and scale inhibitor is mixed with the rest raw materials to prepare the corrosion and scale inhibitor.
Further, the hydroxyl-containing acrylic monomer is one or more of hydroxypropyl (meth) acrylate and hydroxyethyl (meth) acrylate; the acrylic monomer is one or two of acrylic acid or methacrylic acid.
Further, the humic acid is activated humic acid obtained by soaking and washing the humic acid to be neutral by strong base or strong acid and then drying the humic acid.
Still further, the strong base or strong acid soaking treatment: soaking in 20-40% solution of nitric acid, hydrochloric acid or sodium hydroxide, and potassium hydroxide for 30-60 min.
The invention also aims to provide a water treatment method in a circulating cooling water system, wherein the high-concentration-factor slow-release scale inhibitor is added into the circulating cooling water system, and the adding amount of the scale and corrosion inhibitor added per ton is 10-20mg/L calculated by water supplement.
Further, determining an acceptable maximum concentration multiple N according to the detected water quality condition, and analyzing and calculating the dosage of the slow-release scale inhibitor in the supplemented water quantity according to the maximum concentration multiple N; the method comprises the following specific steps:
(1) detecting water quality and Ca in water2+Obtaining the water quality condition of the make-up water by the content, the total alkalinity content, the solid content of the total solution and the PH value;
(2) theoretically, analyzing and predicting the water quality condition Ca under the conditions of different concentration multiples N2+Content, total alkalinity content, total solution solid content; theoretically, the concentration of each ion in water is increased in proportion to the concentration multiple N;
(3) predicting a tendency of the circulating cooling water to be scaled or corroded during the circulating cooling water treatment process by using a saturation index (L.S.I.) and a stability index (R.S.I.);
L.S.I.＝PH-PHs；R.S.I.＝2PHs-PH；
wherein, the PH refers to the actual PH value of the water; PHs refers to calcium carbonate saturation PHs value;
PHs＝(9.7+A+B)-(C+D)；
wherein, A is a total dissolved solid coefficient, B is a temperature coefficient, C is a calcium hardness coefficient, and D is a basicity coefficient;
according to the water quality condition predicted in the step (2): ca2+ containsDetermining corresponding A, C, D coefficient values according to the amount, the total alkalinity content and the total solution solid content, and obtaining corresponding temperature coefficient values B; calculating L.S.I. and R.S.I. values under the conditions of different concentration multiples N and corresponding water temperatures;
(4) determination of the maximum concentration factor N
Predicting the scaling or corrosion tendency under different concentration times N according to the L.S.I. and R.S.I. values under different concentration times N in the step (3), and determining the concentration time N under the condition of scaling but not corroding as the maximum concentration time N;
calculating the supplementary water amount according to the maximum concentration multiple N, and calculating the addition amount of the slow-release scale inhibitor agent according to the supplementary water amount;
the dosage (Kg) of the medicine is equal to the water replenishing quantity (m)3The addition concentration (ppm)/1000 is multiplied by d).
Furthermore, after the water quality condition is detected in the step (1), for water with high acidity or alkalinity, adding alkali or acid to adjust the pH value according to the pH value of the water, and predicting the pH value of the water under different concentration times N.
The invention has the technical effects that:
the invention takes hydroxyl-containing acrylic monomers and acrylic monomers as raw materials, under the action of a catalyst and an initiator, hydroxyl-containing polyacrylate is synthesized, humic acid is added in the reaction process for common reaction, and a mixed product of hydroxyl-containing polyacrylate, humic acid and polyacrylate-humic acid esterified substance is obtained.
The humic acid is activated by strong alkali and strong acid, compared with the original humic acid, the activated humic acid has higher contents of active groups such as carboxyl, hydroxyl, carbonyl and the like on the molecular structure and higher active complexing performance of the humic acid, enhances the chelating effect of the humic acid on metal ions and the dispersing capacity of the humic acid on calcium carbonate and calcium phosphate, and achieves the complexing and solubilizing effects.
The scale inhibitor mainly comprises a mixed product containing hydroxyl polyacrylate, humic acid and polyacrylate-humic acid ester, and has good scale inhibition performance and corrosion inhibition performance under the combined action of the hydrolyzed polymaleic anhydride, zinc salt and a surfactant, and the selected scale inhibitor has excellent scale inhibition performance on calcium carbonate scale, calcium phosphate scale and silicon scale and also has good dispersion effect on ferric oxide, slime and substances with turbidity in water; the selected corrosion and scale inhibitor is easy to form a thin and compact anticorrosive film on the metal surface, and has good corrosion inhibition capability; the stability of the scale inhibitor in circulating water is ensured, the chlorine decomposition resistance is strong, the product is suitable for the retention time of a high concentration multiple requirement in water, and the scale inhibitor is a phosphorus-free scale inhibitor, so that the overhigh phosphorus content in a water body is avoided.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1
A high-concentration multiple corrosion and scale inhibitor for a circulating cooling water system comprises the following raw material components in parts by weight: 8 parts of hydrolyzed polymaleic anhydride, 6 parts of zinc salt, 20 parts of hydroxyl-containing acrylic monomer, 10 parts of acrylic monomer, 40 parts of humic acid, 6 parts of surfactant and 20 parts of water;
the preparation method comprises the following steps:
(1) preparation of humic acid activation: adding a 40% sodium hydroxide aqueous solution to humic acid, adjusting the pH to about 9.0, and adjusting the solid-to-liquid ratio to 0.5: 1, under the condition of stirring, the activation time is 35 minutes, the activation temperature is 80 ℃, centrifugal separation is carried out, filtration and drying are carried out, water washing is carried out until the reaction product is neutral, and the activated humic acid is obtained after centrifugal separation and drying.
(2) Adding hydroxyl-containing acrylic monomers, a catalyst and an initiator into a suitable solvent, stirring and mixing, carrying out polymerization reaction for 2-5h at 70-80 ℃, then adding activated humic acid, carrying out esterification reaction for 2-4h at 120-135 ℃, and after the reaction is finished, decompressing and steaming out the solvent in a reaction system to obtain a mixed product of hydroxyl-containing polyacrylate, humic acid and polyacrylate-humic acid esterified substance;
(3) and (3) mixing the product obtained in the step (2) with the rest raw materials and water, and uniformly stirring to obtain the corrosion and scale inhibitor.
Wherein, the acrylic monomer containing hydroxyl is hydroxyethyl (methyl) acrylate; the acrylic monomer is acrylic acid.
Example 2
The high concentration multiple corrosion and scale inhibitor comprises the following raw material components in parts by weight: 8 parts of hydrolyzed polymaleic anhydride, 6 parts of zinc salt, 10 parts of hydroxyl-containing acrylic monomer, 20 parts of acrylic monomer, 40 parts of humic acid, 6 parts of surfactant and 20 parts of water;
the rest was the same as in example 1.
Example 3
The high concentration multiple corrosion and scale inhibitor comprises the following raw material components in parts by weight: 8 parts of hydrolyzed polymaleic anhydride, 6 parts of zinc salt, 20 parts of hydroxyl-containing acrylic monomer, 20 parts of humic acid, 6 parts of surfactant and 20 parts of water;
the rest was the same as in example 1.
Example 4
The high concentration multiple corrosion and scale inhibitor comprises the following raw material components in parts by weight: 8 parts of hydrolyzed polymaleic anhydride, 6 parts of zinc salt, 15 parts of hydroxyl-containing acrylic monomer, 20 parts of acrylic monomer, 25 parts of humic acid, 6 parts of surfactant and 20 parts of water;
the rest was the same as in example 1.
Comparative example 1
The corrosion and scale inhibitor comprises the following raw material components in parts by weight: 8 parts of hydrolyzed polymaleic anhydride, 6 parts of zinc salt, 25 parts of hydroxyl-containing acrylic monomer, 25 parts of acrylic monomer, 6 parts of surfactant and 20 parts of water;
the rest was the same as in example 1.
Comparative example 2
The corrosion and scale inhibitor comprises the following raw material components in parts by weight: 8 parts of hydrolyzed polymaleic anhydride, 6 parts of zinc salt, 40 parts of humic acid, 6 parts of surfactant and 20 parts of water;
the rest was the same as in example 1.
In order to verify the effect of the invention, the scale inhibitor agents prepared in examples 1 to 4 and the scale inhibitor agents prepared in comparative examples 1 and 2 were subjected to comparative tests of scale inhibition and corrosion inhibition effects at the same dosage:
the water quality of the test raw water is pH6.1, the turbidity is 31 degrees (NTU), and the calcium ion is 1220.5 mg/L.
The scale inhibitor formula of the invention adopts an RCC-II type rotary hanging piece corrosion tester to carry out a corrosion inhibition performance experiment according to a rotary hanging piece method for determining the corrosion inhibition performance of the water treatment agent GB/T18175-2000 of the national standard of the people's republic of China. The test temperature is 50 ℃, the rotating speed is 75r/min, and the test time is 72 hours for brass and 304 stainless steel test pieces (not pre-filmed). The brass and 304 stainless steel test pieces were 72.4X 11.5X 2.0 in specification.
The test results are shown in table 1.
TABLE 1 comparative test results of scale and corrosion inhibitor performance
From the above table, it can be seen that: the scale inhibitor prepared by the formula mainly comprises the mixed product of polyacrylate containing hydroxyl, humic acid and polyacrylate-humic acid ester, and the scale inhibitor mainly comprises humic acid and polyacrylate containing hydroxyl.
Another embodiment of the invention
Adding the high-concentration-multiple slow-release scale inhibitor into a circulating cooling water system, and calculating the adding amount of the scale and corrosion inhibitor added per ton by water supplement to be 20 mg/L.
Determining the acceptable maximum concentration multiple N according to the detected water quality condition, and analyzing and calculating the dosage of the slow-release scale inhibitor in the supplemented water quantity according to the maximum concentration multiple N; the method comprises the following specific steps:
(1) detecting water quality and Ca in water2+Obtaining the water quality condition of the make-up water by the content, the total alkalinity content, the solid content of the total solution and the PH value;
after the water quality condition is detected in the step (1), adding alkali or acid to the water quality with high acidity or alkalinity to adjust the pH value according to the pH value of the water quality, and predicting the pH value of the water quality under the conditions of different concentration multiples N.
(2) Theoretically, analyzing and predicting the water quality condition Ca under the conditions of different concentration multiples N2+Content, total alkalinity content, total solution solid content; theoretically, the concentration of each ion in water is increased in proportion to the concentration multiple N;
(3) predicting a tendency of the circulating cooling water to be scaled or corroded during the circulating cooling water treatment process by using a saturation index (L.S.I.) and a stability index (R.S.I.);
L.S.I.＝PH-PHs；R.S.I.＝2PHs-PH；
wherein, the PH refers to the actual PH value of the water; PHs refers to calcium carbonate saturation PHs value;
PHs＝(9.7+A+B)-(C+D)；
wherein, A is a total dissolved solid coefficient, B is a temperature coefficient, C is a calcium hardness coefficient, and D is a basicity coefficient;
according to the water quality condition predicted in the step (2): ca2+ containsDetermining corresponding A, C, D coefficient values (determined according to a coefficient correspondence table) according to the amount, the total alkalinity content and the total solution solid content, and obtaining corresponding temperature coefficient values B; calculating L.S.I. and R.S.I. values under the conditions of different concentration multiples N and corresponding water temperatures;
(4) determination of the maximum concentration factor N
Predicting the scaling or corrosion tendency under different concentration times N according to the L.S.I. and R.S.I. values under different concentration times N in the step (3), and determining the concentration time N under the condition of scaling but not corroding as the maximum concentration time N;
calculating the supplementary water amount according to the maximum concentration multiple N, and calculating the addition amount of the slow-release scale inhibitor agent according to the supplementary water amount;
the dosage (Kg) of the medicine is equal to the water replenishing quantity (m)3D) x throwThe concentration (ppm)/1000.
According to the high-concentration multiple slow-release scale inhibitor, the adding amount of the scale and corrosion inhibitor added per ton is 20mg/L calculated by water supplement.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A high-concentration multiple corrosion and scale inhibitor for a circulating cooling water system is characterized by comprising the following raw material components in parts by weight: 5-10 parts of hydrolyzed polymaleic anhydride, 5-8 parts of zinc salt, 12-25 parts of hydroxyl-containing acrylic monomer, 12-25 parts of acrylic monomer, 20-40 parts of humic acid, 4-8 parts of surfactant and 10-30 parts of water;
in the preparation of the slow-release scale inhibitor, hydroxyl-containing acrylic monomers and acrylic monomers are used as raw materials, under the action of a catalyst and an initiator, hydroxyl-containing polyacrylate is synthesized through polymerization and esterification of free radicals, humic acid is added in the reaction process for common reaction, and then the corrosion and scale inhibitor is mixed with the rest raw materials to prepare the corrosion and scale inhibitor.
2. The high-concentration multiple corrosion and scale inhibitor for the circulating cooling water system as claimed in claim 1, wherein the hydroxyl-containing acrylic monomer is one or more of hydroxypropyl (meth) acrylate and hydroxyethyl (meth) acrylate; the acrylic monomer is one or two of acrylic acid or methacrylic acid.
3. The high-concentration multiple corrosion and scale inhibitor for the circulating cooling water system as claimed in claim 1, wherein the humic acid is activated humic acid obtained by soaking in strong alkali or strong acid, washing with water to neutrality and drying.
4. The high-concentration multiple corrosion and scale inhibitor for the circulating cooling water system as claimed in claim 3, wherein the strong alkali or strong acid soaking treatment comprises the following steps: soaking in 20-40% solution of nitric acid, hydrochloric acid or sodium hydroxide, and potassium hydroxide for 30-60 min.
5. A water supplementing and chemical adding treatment method in a circulating cooling water system is characterized in that the high-concentration-multiple slow-release scale inhibitor disclosed in claims 1-4 is added into the circulating cooling water system, and the adding amount of the added scale and corrosion inhibitor per ton is 10-20mg/L calculated according to water supplementing.
6. The water supplementing and chemical adding treatment method for the circulating cooling water system according to claim 5, wherein the acceptable maximum concentration multiple N is determined according to the detected water quality condition, and the chemical adding amount of the slow-release scale inhibitor in the supplemented water amount is analyzed and calculated according to the maximum concentration multiple N; the method comprises the following specific steps:
(1) detecting water quality and Ca in water2+Obtaining the water quality condition of the make-up water by the content, the total alkalinity content, the solid content of the total solution and the PH value;
(2) theoretically, analyzing and predicting the water quality condition Ca under the conditions of different concentration multiples N2+Content, total alkalinity content, total solution solid content; theoretically, the concentration of each ion in water is increased in proportion to the concentration multiple N;
(3) predicting a tendency of the circulating cooling water to be scaled or corroded during the circulating cooling water treatment process by using a saturation index (L.S.I.) and a stability index (R.S.I.);
L.S.I.＝PH-PHs；R.S.I.＝2PHs-PH；
wherein, the PH refers to the actual PH value of the water; PHs refers to calcium carbonate saturation PHs value;
PHs＝(9.7+A+B)-(C+D)；
wherein, A is a total dissolved solid coefficient, B is a temperature coefficient, C is a calcium hardness coefficient, and D is a basicity coefficient;
according to the water quality condition predicted in the step (2): ca2+Determining corresponding A, C, D coefficient values according to the content, the total alkalinity content and the total solution solid content, and obtaining corresponding temperature coefficient values B; calculating L.S.I. and R.S.I. values under the conditions of different concentration multiples N and corresponding water temperatures;
(4) determination of the maximum concentration factor N
Predicting the scaling or corrosion tendency under different concentration times N according to the L.S.I. and R.S.I. values under different concentration times N in the step (3), and determining the concentration time N under the condition of scaling but not corroding as the maximum concentration time N;
(5) calculating the supplementary water amount according to the maximum concentration multiple N, and calculating the addition amount of the slow-release scale inhibitor agent according to the supplementary water amount;
the dosage (Kg) of the medicine is equal to the water replenishing quantity (m)3The addition concentration (ppm)/1000 is multiplied by d).
7. The method for supplementing and adding chemicals into circulating cooling water system according to claim 6, wherein after detecting the water quality condition in step (1), for water quality with too high acidity or alkalinity, adding alkali or acid to adjust the pH value according to the pH value of the water quality, and predicting the pH value of the water quality under different concentration times N.
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