Method for reusing recycled water in circulating cooling water

A technology of circulating cooling water and reclaimed water, applied in the direction of complex/solubilizer treatment, etc., can solve the problems of circulating cooling water system corrosion, pipeline corrosion, etc., to ensure safety, reduce the amount of dosing and treatment costs, and solve pipeline corrosion. effect of the problem

Active Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

[0006] The invention relates to a method for reusing reclaimed water for circulating cooling water, which is used to comprehensively solve the problem of pipeline corrosi

Method used

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  • Method for reusing recycled water in circulating cooling water
  • Method for reusing recycled water in circulating cooling water

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Embodiment 1

[0018] Potassium dihydrogen phosphate and zinc sulfate heptahydrate were added to the raw water of reclaimed water, so that the concentrations of total phosphate and zinc salt in the water were 2.88mg / L and 0.85mg / L respectively, and the corrosion evaluation test of reclaimed water pipeline transportation was carried out. The above-mentioned medium water that has been added with potassium dihydrogen phosphate and zinc sulfate heptahydrate is concentrated 5 times under the condition of pH=7.5 ± 0.1, adds acrylic acid / hydroxypropyl acrylate copolymer (the quality of acrylic acid and hydroxypropyl acrylate in the copolymer The ratio is 4:1, and the limiting viscosity number at 30°C is 0.071dL / g)20mg / L, and the corrosion evaluation test of the circulating cooling water system is carried out in this way. The results of the two tests are shown in Table 2.

Embodiment 2

[0020] Add disodium hydrogen phosphate and zinc chloride to the raw water of reclaimed water, so that the concentrations of total phosphate and zinc salt in the water are 1.95mg / L and 0.43mg / L respectively, so as to carry out the corrosion evaluation test of reclaimed water pipeline transportation. Concentrate the above-mentioned medium water with disodium hydrogen phosphate and zinc chloride 4 times under the condition of pH=7.8±0.1, add acrylic acid / 2'-acrylamide-2-methylpropanesulfonic acid copolymer (in the copolymer The mass ratio of acrylic acid to 2'-acrylamide-2-methylpropanesulfonic acid is 5:1, and the limiting viscosity at 30°C is 0.068dL / g) 12mg / L, and the corrosion evaluation test of the circulating cooling water system is carried out with this . The results of the two tests are shown in Table 2.

Embodiment 3

[0022] Sodium phosphate and zinc chloride are added to the raw water of reclaimed water, so that the total phosphate and zinc salt concentrations in the water are 1.37mg / L and 0.55mg / L respectively, and the corrosion evaluation test of reclaimed water pipeline transportation is carried out. Concentrate the above-mentioned reclaimed water with sodium phosphate and zinc chloride 5 times under the condition of pH=7.5±0.1, add acrylic acid / hydroxypropyl acrylate / 2'-acrylamide-2-methylpropanesulfonic acid copolymer ( The mass ratio of acrylic acid, hydroxypropyl acrylate and 2'-acrylamide-2-methylpropanesulfonic acid in the copolymer is 7:2:1, and the limiting viscosity number at 30°C is 0.087dL / g) 14mg / L, In this way, the corrosion evaluation test of the circulating cooling water system was carried out. The results of the two tests are shown in Table 2.

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Abstract

The present invention relates to method for reusing recycled water in circulating cooling water. The method is characterized by comprising steps of: a) adding zinc salt in water through a water outlet of a recycled water production device; b) adding corrosion inhibitor containing phosphorus into water when an original total phosphate concentration (calculated by PO43) of the recycled water is less than 1mg / L; c) adding the treated water as supplement water into a circulating cooling water system; and d) adding a copolymer scale inhibition dispersing agent into the circulating cooling water. The method of the invention has good corrosion inhibition effect on recycled water pipe to guarantee safe transportation of the recycled water; besides, the method can utilize existing phosphorus in the water to reduce drug dosage and treatment cost in circulating cooling water treatment.

Description

technical field [0001] The invention relates to a method for reusing reclaimed water, in particular to a method for reusing reclaimed water for circulating cooling water. Background technique [0002] The total amount of water resources in my country ranks sixth in the world, but the per capita share of water resources is only a quarter of the world's average level, ranking eighty-eighth in the world. With population growth and economic development, the demand for water resources in my country is still increasing. In today's environment of water shortage, in order to realize the sustainable use of water resources, finding a reliable and reusable second water source has become an important way to solve the problem of water shortage. [0003] Reclaimed water mainly refers to non-drinking water that can be reused within a certain range after urban sewage or domestic sewage has reached a certain water quality standard after treatment. standard. The reuse of reclaimed water ha...

Claims

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Application Information

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IPC IPC(8): C02F5/08
Inventor 王岽吴颖郦和生魏新
Owner CHINA PETROLEUM & CHEM CORP
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