Method for treating sulfur-containing circulating cooling water

A technology of circulating cooling water and water treatment agent, applied in special treatment targets, water treatment parameter control, chemical instruments and methods, etc., can solve problems such as leakage, and achieve the effects of reducing energy consumption, simple operation, and saving pharmaceutical costs

Inactive Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the lack of research on high hardness and low alkalinity circulating cooling water leaking sulfur-containing substances in the prior art, and to provide a high-hardness and low-alkalinity circulating cooling water that is especially suitable for leaking sulfur-containing substances. Cooling water treatment method

Method used

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  • Method for treating sulfur-containing circulating cooling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example is used to illustrate the corrosion inhibition effect of using the method of the present invention to treat circulating cooling water containing sulfur.

[0034] The test water is the circulating water of a refinery. The water quality is: calcium ion 1350mg / L, total hardness 1980mg / L, total alkalinity 120mg / L, Cl - 570mg / L, S 2- 0.5mg / L, residual chlorine was not detected.

[0035] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0036] Without changing the original chemical YSW105 (purchased from Beijing Yanhua Jilian Company) in the refinery, sodium hypochlorite was added to make the residual chlorine reach 0.2 mg / L, and a composite corrosion inhibitor (containing maleic anhydride / styrene sulfonic acid copolymerized The aqueous solution of substance, HEDP, benzotriazole and zinc chloride, wherein the maleic anhydride / styrene sulfonic acid copolymer is JNH-406 purchased from Langfang Jinnu...

Embodiment 2

[0038] This example is used to illustrate the corrosion inhibition effect of using the method of the present invention to treat circulating cooling water containing sulfur.

[0039] The test water is the circulating water of a refinery. The water quality is: calcium ion 1350mg / L, total hardness 1980mg / L, total alkalinity 80mg / L, Cl - 570mg / L, S 2- 0.5mg / L, residual chlorine was not detected.

[0040] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0041] Without changing the original chemical YSW105 (purchased from Beijing Yanhua Jilian Company) in the refinery, add sodium hypochlorite to make the remaining chlorine reach 0.4 mg / L, add sodium bicarbonate to make the total alkalinity reach 120 mg / L, add compound Corrosion inhibitor (the aqueous solution containing acrylic acid / styrene sulfonic acid copolymer, HPAA and zinc nitrate, wherein acrylic acid / styrene sulfonic acid copolymer is AA-SSA purchased from H...

Embodiment 3

[0043] This example is used to illustrate the corrosion inhibition effect of using the method of the present invention to treat circulating cooling water containing sulfur.

[0044] The test water is the circulating water of an oil refinery. The water quality is: calcium ion 850mg / L, total hardness 1250mg / L, total alkalinity 180mg / L, Cl - 360mg / L, S 2- 0.5mg / L, residual chlorine was not detected.

[0045] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0046] Without changing the original agent YSW105 (purchased from Beijing Yanhua Jilian Company) in the refinery, sodium hypochlorite was added to make the remaining chlorine reach 0.5 mg / L, and a composite corrosion inhibitor (containing maleic anhydride / allyl sulfonic acid Copolymer, HEDP / ATMP mixed solution, aqueous solution of zinc sulfate, wherein the maleic anhydride / allylsulfonic acid copolymer is SY-414 purchased from Lianyungang Sanyi Water Treatment D...

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Abstract

The present invention relates to the field of water treatment, and discloses a method for treating sulfur-containing circulating cooling water. The method comprises: adding a chlorine-containing oxidizing agent and a composite corrosion inhibitor to sulfur-containing circulating cooling water, and controlling the total alkalinity of the sulfur-containing circulating cooling water at 100-200 mg/L, wherein the residual chlorine in the sulfur-containing circulating cooling water is 0.1-0.8 mg/L with the use amount of the chlorine-containing oxidizing agent, and the composite corrosion inhibitor contains a water-soluble zinc salt, an organic polymer type water treatment agent, and a phosphorus-containing corrosion inhibitor. According to the present invention, by controlling the total alkalinity and the residual chlorine and pouring the specific kind of the composite corrosion inhibitor in the matched manner, the corrosion of the sulfur-containing circulating cooling water can be effectively controlled, the carbon steel corrosion rate meets the technical requirement of less than 0.1 mm/a, and the carbon steel test tube adhesion rate meets the technical requirement of less than 20 mg/(cm2.month); and although the composite corrosion inhibitor containing the water-soluble zinc salt is used, the zinc salt deposition cannot cause the over-standard of the adhesion rate, such that the system does not require the complete replacement after the sulfur-containing material leaks so as to reduce the energy consumption.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for treating sulfur-containing circulating cooling water. Background technique [0002] The processing of highly corrosive high-sulfur crude oil in the refining unit will cause corrosion and perforation of the equipment, and material leakage into the circulating water often occurs; in addition, if the sulfur-containing gas (such as hydrogen sulfide, etc.) generated by the unit is not tightly sealed or handled properly , will leak into the atmosphere, resulting in further dissolution and absorption by the cooling water in the nearby cooling tower. After the sulfur-containing substances enter the circulating cooling water system, the water quality will deteriorate, the conventional water treatment chemicals will fail, and the corrosion and scaling of the cooling equipment in the circulating water system will be aggravated, and the leakage of materials will intens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/08C02F5/10C02F5/14C02F1/66
CPCC02F1/66C02F5/08C02F5/10C02F5/14C02F2209/07C02F2303/08C23F11/08C23F11/173
Inventor 任志峰李巍刘金香郦和生闫岩
Owner CHINA PETROLEUM & CHEM CORP
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