Method of treatment of sulfur-containing circulating cooling water

A technology of circulating cooling water and water solubility, applied in the field of water treatment, can solve problems such as leakage, and achieve the effects of reducing energy consumption, saving pharmaceutical 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. Cooling water treatment method

Method used

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  • Method of treatment of sulfur-containing circulating cooling water

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] 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.

[0031] The test water is the circulating water of an oil refinery. The water quality is: calcium ion 785mg / L, total hardness 1150mg / L, total alkalinity 120mg / L, Cl - 290mg / L, S 2- 0.5mg / L, residual chlorine was not detected.

[0032] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0033] Without changing the original agent YSW105 (purchased from Beijing Yanhua Jilian Company) used in the refinery, NaHCO 3 Adjust the total alkalinity of the test water to 250mg / L, add sodium hypochlorite to make the residual chlorine reach 0.4mg / L, and add 4.8mg / L composite corrosion inhibitor (containing HEDP and zinc chloride at a weight ratio of 5:1). The results are shown in Table 1.

Embodiment 2

[0035] 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.

[0036] The test water is the circulating water of a refinery. The water quality is: calcium ion 1200mg / L, total hardness 1750mg / L, total alkalinity 80mg / L, Cl - 450mg / L, S 2- 0.5mg / L, residual chlorine was not detected.

[0037] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0038] Without changing the original agent YSW105 (purchased from Beijing Yanhua Jilian Company) used in the refinery, NaHCO 3 Adjust the total alkalinity of the test water to 200mg / L, add sodium hypochlorite to make the remaining chlorine reach 0.6mg / L, and add 6.2mg / L composite corrosion inhibitor (containing HPAA and zinc nitrate at a weight ratio of 25:6). The results are shown in Table 1.

Embodiment 3

[0040] 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.

[0041] 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.

[0042] Dosing the corrosion test on the rotating coupons after adding chemicals to the test water in the following way:

[0043] Without changing the original agent YSW105 (purchased from Beijing Yanhua Jilian Company) used in the refinery, NaHCO 3 Adjust the total alkalinity of the test water to be 200mg / L, add sodium hypochlorite to make the remaining chlorine reach 0.8mg / L, add 4.6mg / L composite corrosion inhibitor (containing HEDP, ATMP and zinc sulfate with a weight ratio of 10:5:8 ). The results are shown in Table 1.

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Abstract

The invention relates to the field of water treatment and discloses a method of treatment of sulfur-containing circulating cooling water. The method includes the steps of: adding a chlorine-containing oxidant and a compound corrosion inhibitor to the sulfur-containing circulating cooling water, and controlling the total alkalinity of the sulfur-containing circulating cooling water to be 170-300 mg / L, wherein the use amount of the chlorine-containing oxidant ensures that the residual chlorine in the sulfur-containing circulating cooling water is 0.2-1 mg / L. The compound corrosion inhibitor comprises water-soluble zinc salt and an organic-phosphorus corrosion inhibitor. By controlling the total alkalinity and the residual chlorine and adding the compound corrosion inhibitor in a special type, corrosion of the sulfur-containing circulating cooling water is effectively controlled, wherein corrosion rate of carbon steel satisfies the technical demand of being less than 0.1 mm / a and carbon test tube adhesion rate satisfies the technical demand of being less than 20 mg / (cm<2>*month). Although the compound corrosion inhibitor containing the water-soluble zinc salt is employed, the adhesion rate does not exceed the standard due to deposition of the zinc salt, so that complete replacement of the system due to leakage of sulfur containing substances is unnecessary, thereby reducing 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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IPC IPC(8): C02F5/08C02F5/10C02F5/12C02F103/34
Inventor 任志峰李巍郦和生刘金香闫岩
Owner CHINA PETROLEUM & CHEM CORP
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