Method for treating recirculated cooling water containing sulfur

A technology of circulating cooling water and treatment method, which is applied in the treatment field of suppressing the corrosiveness of sulfur-containing circulating cooling water, which can solve the problems of non-renewable recycling, aggravation of water quality nutrition, and environmental pollution, so as to save the cost of chemicals and improve eutrophication The effect of globalization and environmental protection

Active Publication Date: 2014-02-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned phosphorus-containing chemicals will aggravate the nutrientization of water quality, and direct discharge will cause environmental pollution.
"Study on Removal of Sulfides in Highly Sulfur-Contained Water" (North China Electric Power Technology, p19, 2000.5, Xie Xuejun, etc.) mentioned a method of removing sulfur ions in circulating water with industrial ferrous sulfate an

Method used

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  • Method for treating recirculated cooling water containing sulfur
  • Method for treating recirculated cooling water containing sulfur
  • Method for treating recirculated cooling water containing sulfur

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment adopts 20 # Carry out the corrosion test of the rotating coupon on carbon steel, refer to HG / T2159-91, the test temperature is 50 ℃, the speed is 75 rpm, and the operation is 72 hours.

[0024] Circulating cooling water quality of an oil refinery: calcium hardness 250mg / L, total alkalinity 250mg / L, Cl - 40mg / L, SO 4 2- 30mg / L, with NaHCO 3 Adjust its alkalinity to 320mg / L, and add different concentrations of Na 2 S, then add 960mg / L iron complex solution (6% iron nitrate, 5% EDTA tetrasodium salt, 5% nitrilotriacetic acid trisodium salt, 4% sorbitol, 80% deionized Water), the corresponding iron element mass concentration is 8mg / L, the results are shown in Table 1. It can be seen from Table 1 that after adding complex iron, the corrosion rate decreases, which can be as low as below 0.075mm / a. at 1mg / L S 2- For example, in the 72h test, the increase in suspended solids and the change in iron mass concentration were both below 0.1mg / L.

[0025] Tabl...

Embodiment 2

[0028] The present embodiment coupon corrosion test condition and circulating water quality parameter are the same as embodiment 1, with dilute H 2 SO 4 or NaHCO 3 Adjust its alkalinity to 150mg / L or 320mg / L, and add 1.0mg / L Na without changing the current chemical used in the refinery 2 S, then add 960mg / L iron complex solution (6% iron nitrate, 5% EDTA tetrasodium salt, 5% nitrilotriacetic acid trisodium salt, 4% sorbitol, 80% deionized Water), the corresponding iron element mass concentration is 8mg / L, the results are shown in Table 2. It can be seen from Table 2 that higher alkalinity is more conducive to reducing corrosion.

[0029] Table 2

[0030]

Embodiment 3

[0032]The present embodiment coupon corrosion test condition and circulating water quality parameter are the same as embodiment 1, with NaHCO 3 Adjust its alkalinity to 320mg / L, and add 1.0mg / LNa without changing the current chemical used in the refinery 2 S, then add 960mg / L iron complex solution (6% ferric nitrate, 10% nitrilotriacetic acid trisodium salt (Na 3 NTA), 84% deionized water), the corresponding iron concentration is 8mg / L. The added amount of sorbitol was 0 or 30mg / L respectively. Quantitatively analyze the filtrate after filtering circulating water to determine Na 3 Loss of NTA (determined by liquid chromatography for Na 3 Concentration changes of NTA). The results are shown in Table 3. It can be seen from Table 3 that the addition of sorbitol can reduce the degradation rate of α-amino acid.

[0033] table 3

[0034]

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Abstract

The invention relates to a method for treating recirculated cooling water containing sulfur. The method comprises a step that a water-soluble chelate of ferrous iron and/or ferric iron is added to the recirculated cooling water containing sulfur, and the consumption of the water-soluble iron chelate by iron is 5-20 if the mass of a sulfur ion in the recirculated cooling water is treated as 1. The method can effectively inhibit the corrosion of the recirculated cooling water containing sulfur to metal apparatuses and pipelines.

Description

technical field [0001] The invention relates to a treatment method for sulfur-containing circulating cooling water. Specifically, the present invention relates to a treatment method for suppressing the corrosivity of sulfur-containing circulating cooling water. Background technique [0002] In recent years, due to the shortage of oil resources, the amount of high-sulfur crude oil refined by various refineries has increased. The highly corrosive high-sulfur crude oil will seriously corrode the equipment during processing, and the medium will leak into the circulating water. After the sulfide-containing process medium leaks into the circulating water, the S, S 2- , SO 4 2- as the main form, S and SO 4 2- can be reduced to S under the action of sulfate-reducing bacteria 2- . S in the water 2- Because its outer electron cloud is easily deformed and has strong penetrating ability, it has a higher effect on steel than Cl - More corrosive, a small amount of S 2- It will ...

Claims

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Application Information

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IPC IPC(8): C23F11/06
Inventor 高敏李本高余伟发李财富
Owner CHINA PETROLEUM & CHEM CORP
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