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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, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as pipeline corrosion, inhibit corrosion and reduce eutrophication risk, the effect of ensuring safety

Active Publication Date: 2015-10-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems of corrosion of pipelines caused by reclaimed water in the transportation process and eutrophication of water caused by a large amount of phosphorus-containing chemicals when reclaimed water is reused in the circulating cooling water system, the purpose of the present invention is to provide an effective Method for inhibiting corrosion of reclaimed water delivery pipes and circulating cooling water system without adding phosphorus-containing corrosion inhibitor to reclaimed reclaimed water for recirculating cooling water

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Take 1# medium water as test water, add sodium tartrate and zinc sulfate heptahydrate to it, make sodium tartrate and zinc sulfate (as Zn 2+ The concentrations in reclaimed water are 12mg / L and 0.8mg / L respectively, and the corrosion evaluation test for reclaimed water pipeline transportation is carried out. Concentrate the above-mentioned reclaimed water by 4.5 times under the condition of pH=8.1±0.1. In the simulated production site, the reclaimed water added with the aforementioned corrosion inhibitor is added to the recirculating cooling water system as the supplementary water of the recirculating cooling water, thus obtaining the simulated recirculating cooling system. water. Add polyaspartic acid (the limiting viscosity at 30°C is 0.082dL / 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 monomer copolymerization ...

Embodiment 2

[0047] With 2# medium water as test water, add potassium molybdate and zinc sulfate heptahydrate to it and make potassium molybdate (with MoO 4 2- In terms of) and zinc salts (in terms of Zn 2+ The concentrations in reclaimed water are 10mg / L and 0.5mg / L respectively, and the corrosion evaluation test for reclaimed water pipeline transportation is carried out. Concentrate the above-mentioned reclaimed water by 4.5 times under the condition of pH=8.5±0.1. In the simulated production site, the reclaimed water added with the aforementioned corrosion inhibitor is added to the recirculating cooling water system as the supplementary water of the recirculating cooling water, thus obtaining the simulated recirculating cooling water . Add polyaspartic acid (the limiting viscosity at 30°C is 0.068dL / g), 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 limiting viscosity ...

Embodiment 3

[0049] Take 2# medium water as the test water, add sodium molybdate dihydrate, sodium gluconate and zinc chloride to it and make sodium molybdate (with MoO 4 2- In terms of), sodium gluconate and zinc salt (in Zn 2+ The concentrations in reclaimed water are 8mg / L, 7mg / L and 0.4mg / L respectively, and the corrosion evaluation test for reclaimed water pipeline transportation is carried out. The above reclaimed water is concentrated 5 times under the condition of pH=8.3±0.1. In the simulated production site, the reclaimed water added with the aforementioned corrosion inhibitor is added to the recirculating cooling water system as the supplementary water of the recirculating cooling water, thus obtaining the simulated recirculating cooling system. water. Add polyepoxysuccinic acid (the limiting viscosity at 30°C is 0.030dL / g) and acrylic acid-hydroxypropyl acrylate copolymer (the product obtained by copolymerization of acrylic acid monomer and hydroxypropyl acrylate monomer at a ...

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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 zinc salt corrosion inhibitor and a first corrosion inhibitor into the reclaimed water with the first corrosion inhibitor containing hydroxyl carboxylate and / or a transition metal salt corrosion inhibitor and being different from the zinc salt corrosion inhibitor; (2) adding the reclaimed water to which the zinc salt corrosion inhibitor and the first 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 effectively inhibit corrosion to the reclaimed water conveying pipelines and the recirculating cooling water system. When the reclaimed water is recycled as the recirculating cooling water, no phosphor corrosion inhibitor is needed to be added into 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): C02F9/04
Inventor 王岽吴颖郦和生魏新陈超王洪英
Owner CHINA PETROLEUM & CHEM CORP
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