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A method for recycling reclaimed water to a circulating cooling water system

A technology for circulating cooling water and reclaimed water, applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc., can solve problems such as pipeline corrosion, achieve corrosion inhibition, ensure safety, reduce rich The effect of nutritional risk

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that when reclaimed water is reused in the circulating cooling water system, there are problems of corrosion of reclaimed water to pipelines during the transportation process and the need to add phosphorus-containing corrosion inhibitors to the circulating cooling water, the purpose of the present invention is to provide an effective Method for inhibiting corrosion of reclaimed water delivery pipeline and circulating cooling water system, and reducing or reusing reclaimed water containing phosphorus corrosion inhibitor for circulating cooling water

Method used

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  • A method for recycling reclaimed water to a circulating cooling water system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 1# middle water as test water, add dihydrate sodium molybdate and tolyl benzotriazole therein, make the dihydrate sodium molybdate (as MoO 4 2- The concentration is 15mg / L, and the concentration of tolyl benzotriazole is 3mg / L, so as to carry out the corrosion evaluation test of reclaimed water pipeline transportation. The above reclaimed water is concentrated 5 times under the condition of pH=8.1±0.1, and the reclaimed water added with the aforementioned corrosion inhibitor in the production site is simulated as the replenishment water of the recirculating cooling water and added to the recirculating cooling water in the recirculating cooling water system to obtain Simulate circulating cooling water. Add polyaspartic acid (limited viscosity at 30°C is 0.055dL / g) and acrylic acid-methyl acrylate-2-acrylamide-2-methylpropanesulfonic acid copolymer (weight ratio is 3:1:1 Acrylic acid monomer, methyl acrylate monomer and 2-acrylamide-2-methylpropanesulfonic acid mon...

Embodiment 2

[0042] Take 2# middle water as test water, add potassium molybdate and benzotriazole therein, make the potassium molybdate in middle water (as MoO 4 2- The concentration of benzotriazole is 20mg / L, and the concentration of benzotriazole is 1mg / L, so as to carry out the corrosion evaluation test of reclaimed water pipeline transportation. Concentrate the above-mentioned reclaimed water by 4 times under the condition of pH=8.6±0.1, and simulate the state where the reclaimed water added with the aforementioned corrosion inhibitor in the production site is added to the recirculating cooling water in the recirculating cooling water system as replenishment water of the recirculating cooling water to obtain Simulate circulating cooling water. Add polyepoxysuccinic acid (the limiting viscosity at 30°C is 0.042dL / g), acrylic acid-hydroxypropyl acrylate copolymer (a product obtained by copolymerization of acrylic acid monomer and hydroxypropyl acrylate monomer at a weight ratio of 3:1)...

Embodiment 3

[0044] Take 1# middle water as test water, add dihydrate sodium molybdate and tolyl benzotriazole therein, make the dihydrate sodium molybdate (as MoO 4 2- The concentration is 18mg / L, and the concentration of tolyl benzotriazole is 2mg / L, so as to carry out the corrosion evaluation test of reclaimed water pipeline transportation. Concentrate the above-mentioned reclaimed water by 2.5 times under the condition of natural pH value, and simulate the state where the reclaimed water added with the aforementioned corrosion inhibitor in the production site is added to the recirculating cooling water in the recirculating cooling water system as the supplementary water of the recirculating cooling water to obtain a simulated cycle Cooling water. Add polyepoxysuccinic acid (the limiting viscosity at 30°C is 0.060dL / g) and acrylic acid-ethyl acrylate copolymer (a product obtained by copolymerization of acrylic acid monomer and ethyl acrylate monomer with a weight ratio of 4:1, 30 The ...

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Abstract

The invention discloses a method of recycling reclaimed water for a recirculating cooling water system. The method comprises steps of: (1) adding a transition metal salt corrosion inhibitor and an azole corrosion inhibitor into the reclaimed water; (2) adding the reclaimed water to which the transition metal salt corrosion inhibitor and the azole corrosion inhibitor are added in the step (1) as replenishing water of recirculating cooling water into the recirculating cooling water of the recirculating cooling water system; and (3) adding a non-phosphorus scale inhibitor and a co-polymer scale-inhibiting dispersant into the recirculating cooling water to which the reclaimed water is added in the step (2). The method can assure water conveying safety and simplify a treatment technology of the recirculating cooling water.

Description

technical field [0001] The invention relates to a method for recycling reclaimed water to a circulating cooling water system. Background technique [0002] Nowadays, water resources are increasingly scarce. In order to realize the sustainable use of water resources, reclaimed water, as a reliable and reusable second water source, has attracted more and more attention. Reclaimed water mainly refers to non-drinking water that can be reused within a certain range after urban sewage or domestic sewage has been treated to meet certain water quality standards. . The reuse of reclaimed water has been implemented abroad for a long time, and the reuse scale is very large, showing obvious economic benefits. [0003] my country's industrial water consumption is huge, among which circulating cooling water accounts for the largest proportion, and the water quality requirements of the circulating cooling water system for its supplementary water are slightly lower than those of other pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/08C02F5/10C23F11/18C23F11/14
Inventor 王岽吴颖郦和生魏新陈超王洪英
Owner CHINA PETROLEUM & CHEM CORP
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