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Method for treating circulating cooling water

A technology of circulating cooling water and treatment cycle, which is applied in natural water treatment, multi-stage water treatment, non-polluted water treatment, etc. It can solve the problems of uneconomical, high concentration of chemical dosing, etc., and achieve easy control and low chemical dosage. Low, the effect of saving fresh water

Active Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the low-temperature scaling problem, this document compounded a new type of agent on the basis of the commonly used corrosion and scale inhibition formula, but the concentration of the agent was large (40-80mg / L), which was uneconomical.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0022] The second medicament can be the same as or different from the first medicament, and common corrosion inhibitors in this field (that is, medicaments mainly having corrosion-inhibiting properties) can be used. However, in order to obtain better scale and corrosion inhibition effects and further reduce the dosage, according to a preferred embodiment of the present invention, the second medicament includes (is) phosphate and / or polyphosphate, and the second medicament is PO 4 3- The metered dosage is 2-4mg / L (more preferably 2.2-3.8mg / L).

[0023] The phosphate can be various water-soluble phosphates common in the art, as long as PO can be produced after being added to water 4 3- That's it. More preferably, the phosphate is selected from one or more of sodium phosphate, potassium phosphate, sodium hydrogen phosphate, potassium hydrogen phosphate, sodium dihydrogen phosphate and potassium dihydrogen phosphate.

[0024] The polyphosphate can be water-soluble polyorthopho...

Embodiment 1

[0049] Take the test raw water, add zinc sulfate, HEDP and acrylic acid / 2-methyl-2'-acrylamido propane sulfonic acid copolymer to make Zn in the water 2+ , HEDP and acrylic acid / 2-methyl-2'-acrylamido propane sulfonic acid copolymer concentrations were 0.45mg / L, 0.8mg / L, 1.6mg / L, and then 20 # The carbon steel test piece is suspended in water, and then passed through N in the water 2 2h, pass N 2 After the end, samples were taken to measure the calcium ion concentration (denoted as Ca 1 ), followed by the pass N 2 The final test water was placed in a constant temperature box at 5°C, and after 18 hours, it was taken out to measure the calcium ion concentration (denoted as Ca 2 ), while measuring 20 # Corrosion rate of carbon steel test piece (denoted as F 1 );

[0050] Add sodium phosphate to test water 1-1 to make PO in water 4 3- The concentration is (2.2 / 5) mg / L, then placed in a water bath at 80°C to concentrate 5 times, and after cooling, measure the calcium ion c...

Embodiment 2

[0053] Take test raw water 1, add zinc sulfate, zinc chloride, PBTCA, acrylic acid / 2-methyl-2'-acrylamido propane sulfonic acid copolymer to make Zn in the water 2+ , PBTCA, acrylic acid / 2-methyl-2'-acrylamido propane sulfonic acid copolymer concentrations were 0.65mg / L, 1.2mg / L, 1.8mg / L, and then 20 # The carbon steel test piece is suspended in water, and then passed through N in the water 2 2h, pass N 2 After the end, samples were taken to measure the calcium ion concentration (denoted as Ca 1 ), followed by the pass N 2 The final test water was placed in a constant temperature box at 5°C, and after 18 hours, it was taken out to measure the calcium ion concentration (denoted as Ca 2 ), while measuring 20 # Corrosion rate of carbon steel test piece (denoted as F 1 );

[0054] Add sodium hexametaphosphate to test water 1-1 to make PO in water 4 3- The concentration is (3.8 / 5) mg / L, then placed in a water bath at 80°C to concentrate 5 times, and after cooling, measure ...

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Abstract

The invention relates to the field of circular cooling water treatment, and discloses a method for treating circulating cooling water. The method comprises the steps that fresh water is adopted as cooling water of an air precooling system, and first agentia is put in the air precooling system; water flowing out of the air precooling system is taken as supplementary water of a circulating cooling water system, and second agentia is put in the supplementary water of the circulating cooling water system; the sum of calcium ion concentration and total alkalinity of the fresh water is less than orequal to 100 mg / L; the first agentia comprises a copolymer of crylic acid and 2-methyl-2'-acrylamide propane sulfonic acid, zinc salt and organic phosphonic acid. According to the method, by changingthe water supplementing point of the fresh water and reasonably adding the scale and corrosion inhibition components, the scaling and corrosion problems of the air precooling system and the circulating cooling water system are solved, the adding amount of the agentia is lower, and the method is especially beneficial for reducing production cost.

Description

technical field [0001] The invention relates to the field of circulating cooling water treatment, in particular to a method for treating circulating cooling water. Background technique [0002] In the petrochemical industry, water is often used to cool the process medium. The cooling water system includes a direct-flow cooling water system and a circulating cooling water system. The cooling water in the direct-flow cooling water system is discharged after only one heat exchange. The large water consumption does not meet the national conditions. , and the circulating cooling water system can realize the recycling of cooling water and greatly save the amount of fresh water, so it is widely adopted. Nowadays, the open circulating cooling water system is widely used. After the cooling water exchanges heat with the heat medium, the temperature drops after returning to the cooling tower to exchange heat with the air, and then returns to the process system to exchange heat with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14C02F103/02
CPCC02F5/145C02F2103/023C02F2301/08
Inventor 楼琼慧郦和生秦会敏谢文州吴颖王洪英张春原
Owner CHINA PETROLEUM & CHEM CORP
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