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Method for recycling reclaimed water in 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, reduce difficulty and reduce water eutrophication risk, the effect of ensuring safety

Active Publication Date: 2014-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that when the reclaimed water is reused in the circulating cooling water system at present, there is a problem that the reclaimed water corrodes the pipeline during the transportation process and the problem that a phosphorus-containing corrosion inhibitor needs to be added 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 reusing reclaimed water without phosphorus-containing corrosion inhibitor for circulating cooling water

Method used

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  • Method for recycling reclaimed water in circulating cooling water system

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0047] Add 990g of acrylic acid, 510g of 2'-acrylamide-2-methylpropanesulfonic acid, 3500g of deionized water, 90g of ammonium persulfate into the reaction kettle, pass high-purity nitrogen to remove oxygen for 0.5h, and continue to pass nitrogen until the thermocouple in the polymerization kettle The temperature began to rise, the reaction temperature was 80°C, and the reaction time was 2h. After the end of the polymerization reaction, cool to obtain a mass concentration of 30% acrylic acid / 2'-acrylamide-2-methylpropanesulfonic acid polymer solution. The limiting viscosity of the acrylic acid / 2'-acrylamide-2-methylpropanesulfonic acid polymer at 30°C is 0.095dL / g.

Embodiment 1

[0049] Take reclaimed water 1 as the test water, add slaked lime to it, and take per liter of reclaimed water as the basis, slaked lime (as CaCO 3 The amount of addition is 120mg / L, and the filtered supernatant is added with sodium silicate (n=3.0) (based on SiO 2 Calculated) 30mg / L, in order to carry out the corrosion evaluation test of reclaimed water pipeline transportation. Concentrate the above water by 5.5 times, add the acrylic acid / 2'-acrylamide-2-methylpropanesulfonic acid polymer solution prepared in Preparation Example 1 to polymerize the acrylic acid / 2'-acrylamide-2-methylpropanesulfonic acid The effective concentration of the substance is 15mg / L and 3.0mg / L of mercaptobenzothiazole is added to carry out the corrosion evaluation test of the circulating cooling water system. The results of the two tests are shown in Table 2.

preparation example 2

[0051] Add 1200g of acrylic acid, 300g of isoprene sulfonic acid, 3500g of deionized water, 90g of ammonium persulfate into the reaction kettle, pass high-purity nitrogen to remove oxygen for 0.5h, continue to pass nitrogen until the thermocouple in the polymerization kettle starts to heat up, and the reaction temperature is 80 ℃, reaction time 2h. After the polymerization reaction is completed, cool to obtain an acrylic acid / isoprene sulfonic acid polymer solution with a mass concentration of 30%. The measured intrinsic viscosity of acrylic acid / isoprene sulfonic acid at 30°C is 0.069 dL / g.

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Abstract

The invention discloses a method for recycling reclaimed water in a circulating cooling water system. The method is characterized by comprising the following steps: (1) adding lime to the reclaimed water to carry out softening treatment and then carrying out solid-liquid separation; (2) adding silicates as corrosion inhibitors to the reclaimed water obtained after solid-liquid separation in the step (1); (3) adding the reclaimed water to which the silicates are added in the step (2) to circulating cooling water of the circulating cooling water system as replenished water of circulating cooling water; (4) adding polymer scale inhibitors and dispersants to the circulating cooling water to which the reclaimed water is added in the step (3). By adopting the method, non-phosphorus operation can be achieved in the whole process from reclaimed water transport to circulating cooling water system operation, thus avoiding the risk of water body eutrophication caused by circulating water pollution discharge and effectively reducing corrosion of transport pipelines caused by the reclaimed 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 reached a certain water quality standard after treatment. standard. 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 ...

Claims

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Application Information

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IPC IPC(8): C02F5/08C02F5/10C02F5/12
Inventor 吴颖王岽郦和生魏新王洪英
Owner CHINA PETROLEUM & CHEM CORP
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