Treatment method for sulfur-containing circulating cooling water

A technology of circulating cooling water and water treatment agent, which is applied in the field of water treatment, can solve problems such as leakage, and achieve the effects of reducing energy consumption, saving chemical costs, and simple operation

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. Low Phosphorus (or No Phosphorus) Treatment Method for Cooling Water

Method used

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  • Treatment method for sulfur-containing circulating cooling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 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.

[0033] The test water is the circulating water of a refinery. The water quality is: calcium ion 1070mg / L, total hardness 1550mg / L, total alkalinity 100mg / L, Cl - 450mg / L, S 2- 1mg / L, residual chlorine was not detected.

[0034] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0035] Without changing the original chemical YSW105A (purchased from Beijing Yanhua Jilian Company) in the refinery, add sodium bicarbonate to make the total alkalinity reach 200mg / L, add sodium hypochlorite to make the residual chlorine reach 0.2mg / L, add compound Corrosion inhibitor (the aqueous solution containing maleic anhydride / styrene sulfonic acid copolymer and zinc chloride, wherein maleic anhydride / styrene sulfonic acid copolymer is JNH-406 purchased from ...

Embodiment 2

[0037] 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.

[0038] The test water is the circulating water of a refinery. The water quality is: calcium ion 1250mg / L, total hardness 1810mg / L, total alkalinity 100mg / L, Cl - 530mg / L, S 2- 1mg / L, residual chlorine was not detected.

[0039] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0040] Without changing the original chemical YSW105A (purchased from Beijing Yanhua Jilian Company) in the refinery, sodium hypochlorite was added to make the remaining chlorine reach 0.4 mg / L, sodium bicarbonate was added to make the total alkalinity reach 200 mg / L, and compound Corrosion inhibitor (containing the aqueous solution of acrylic acid / styrene sulfonic acid copolymer and zinc nitrate, wherein acrylic acid / styrene sulfonic acid copolymer is AA-SSA purchas...

Embodiment 3

[0042] 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.

[0043] The test water is the circulating water of an oil refinery. The water quality is: calcium ion 850mg / L, total hardness 1230mg / L, total alkalinity 180mg / L, Cl - 360mg / L, S 2- 1mg / L, residual chlorine was not detected.

[0044] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0045] Without changing the original chemical YSW105A (purchased from Beijing Yanhua Jilian Company) in the refinery, add sodium bicarbonate to make the total alkalinity reach 200mg / L, add sodium hypochlorite to make the remaining chlorine reach 0.5mg / L, add compound Corrosion inhibitor (an aqueous solution containing maleic anhydride / allyl sulfonic acid copolymer and zinc sulfate, wherein the maleic anhydride / allyl sulfonic acid copolymer is SY-414 purchased fro...

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Abstract

Relating to the field of water treatment, the invention discloses a treatment method for sulfur-containing circulating cooling water. The method includes: adding a chlorine-containing oxidizing agent and a compound corrosion inhibitor into sulfur-containing circulating cooling water, and maintaining the total alkalinity of the sulfur-containing circulating cooling water at 170-300mg / L. Specifically, the dosage of the chlorine-containing oxidizing agent can bring the residual chlorine in the sulfur-containing circulating cooling water at 0.1-0.6mg / L, and the compound corrosion inhibitor contains a water-soluble zinc salt and an organic polymer type water treatment agent. Through control of the total alkalinity and residual chlorine and cooperation with adding of specific type compound corrosion inhibitor, corrosion of sulfur-containing circulating cooling water can be effectively controlled under the circumstance of a low phosphorus content, and the carbon steel corrosion rate satisfies the technical requirement of less than 0.1mm / a. And the carbon steel test tube adhesion rate is less than 20mg / (cm<2>.month). Although the compound corrosion inhibitor containing a water-soluble zinc salt is still used, the adhesion rate does not exceed the standard because of zinc salt deposition. Therefore, complete replacement of a system is unnecessary after leakage of a sulfur-containing substance, and the energy consumption is reduced.

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): C02F5/08C02F5/10C02F5/14C02F5/12C02F101/10C02F103/36
CPCC02F5/08C02F5/105C02F5/125C02F5/145C02F2101/101C02F2103/365C02F2209/07C02F2303/08
Inventor 任志峰李巍闫岩郦和生刘金香
Owner CHINA PETROLEUM & CHEM CORP
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