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Method for reuse of reclaimed water in circulating cooling water

A technology for circulating cooling water and reclaimed water, which is applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc. Bio-sludge formation, reduction and water treatment costs, and the effect of reducing the amount of addition

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with fresh water, reclaimed water lacks relative stability, and its water quality is complex and changeable
The reuse of reclaimed water for industrial circulating cooling water also needs to solve the problems of corrosion, scaling and microbial reproduction, and it is more difficult to control due to the complexity of reclaimed water, especially the problem of microbial reproduction is more prominent, with high turbidity and corrosion. more serious
In addition, there is a certain concentration of orthophosphorus in reclaimed water. Orthophosphorus easily forms phosphate scale with calcium and magnesium ions in the water. This kind of scale is not easy to remove, which will affect the heat transfer efficiency of the circulating water system and affect normal production.

Method used

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  • Method for reuse of reclaimed water in circulating cooling water
  • Method for reuse of reclaimed water in circulating cooling water
  • Method for reuse of reclaimed water in circulating cooling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-12 and comparative example 1-9

[0045] Examples 1-12 and comparative examples 1-9 are used to illustrate the corrosion inhibition effect and calcium phosphate scale inhibition effect of the method of the present invention and the reference method of the present invention.

[0046] Supplement Ca in Filtrate 1, Filtrate 2 and Filtrate 3 in Table 2 2+ and PO 4 3- The amount until the concentration multiple is 5 times is equivalent to the circulating cooling water when the reclaimed water is used as the supplementary water of the circulating cooling water, and the treated water is used as the test water for the corrosion inhibition effect and the calcium phosphate scale inhibition effect test. Orthophosphorus concentrations were as follows:

[0047] table 3

[0048] project

Test water 1

Test water 2

Test water 3

Orthophosphorus / (mg / L)

2.92

6.68

13.65

[0049] The test methods for performance evaluation of scale and corrosion inhibitors are as follows:

[00...

Embodiment 13-15 and comparative example 10-13

[0076] This example and comparative example are used to illustrate the scale and corrosion inhibition effects of the method of the present invention and the reference method and the inhibition effect on heterotrophic bacteria.

[0077] According to the chemical industry standard HG / T 2160-91 of the People's Republic of China, the dynamic simulation test is carried out, and the test control parameters are as follows:

[0078] Concentration multiple (indicating the ratio of the salt content of the circulating cooling water to the salt content of the make-up water): 5.0±0.2

[0079] System velocity of circulating water: 1.0m / s

[0080] The temperature of the circulating water at the inlet of the heat exchanger: 32±1°C

[0081] Temperature difference between inlet and outlet of circulating water: 10℃

[0082] pH value of circulating water: 8.0.

Embodiment 13

[0084] This example is used to illustrate the method of reclaiming reclaimed water for circulating cooling water provided by the present invention.

[0085] (1) According to filtrate 1 in table 2, join in the circulating cooling system as supplementary water, after the concentration multiple of circulating cooling water reaches 5, the concentration of orthophosphorus in circulating water is 2.95mg / L, add polymer respectively in circulating cooling water Aspartic acid (limiting viscosity is 0.059dl / g), acrylic acid / styrenesulfonic acid copolymer (weight ratio is 7:3, limiting viscosity is 0.081dl / g) and zinc sulfate heptahydrate, the effective concentrations are respectively 6mg / L, 8mg / L, 2mg / L;

[0086] (2) Add sodium dichloroisocyanurate, isothiazolinone, sodium dichloroisocyanurate and lauramide every three days to the circulating water obtained in step (1), and the dosing concentration is 50mg / L and 70mg respectively / L, 50mg / L and 10mg / L.

[0087] (3) After 15 days of te...

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Abstract

The invention relates to a method for reuse of reclaimed water in circulating cooling water. The method comprises the steps of: (1) filtering reclaimed water and taking the filtered reclaimed water as make-up water of circulating cooling water; (2) adding a scale and corrosion inhibitor into the circulating cooling water, with the scale and corrosion inhibitor containing: A) polyaspartic acid and / or polyepoxysuccinic acid; B) a phosphorus-free copolymer containing a carboxylic acid group; C) a zinc salt and optionally D) a copper corrosion inhibitor; and (3) adding a bactericide and a nonionic surfactant into the circulating cooling water before and / or at the same time of and / or after adding the scale and corrosion inhibitor into the circulating cooling water. According to the method, the use of the reclaimed water as the make-up water of circulating cooling water in a circulating cooling water system can prevent the formation of calcium phosphate scale and the generation of corrosion and biological slime. Therefore, the use of the reclaimed water as the make-up water of circulating cooling water is effective.

Description

technical field [0001] The invention relates to a method for reclaiming reclaimed water for circulating cooling water, more specifically, the invention relates to a treatment method for using secondary biochemically treated water as replenishing water for a circulating cooling water system. Background technique [0002] my country is a country with very poor water resources, and the per capita water resources are about 1 / 4 of the world's per capita. Water shortage has become a restrictive factor for the development of urban economy and the improvement of people's lives, and the reuse of reclaimed water is a good way to solve the problem of water shortage and an effective way to realize urban sewage resources. Proper operation can obtain good social benefits and environmental protection. efficiency, economic efficiency and resource efficiency. [0003] Industry is a large user of urban water, and industrial circulating cooling water accounts for more than 50% of it. If the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/10C02F5/12
Inventor 王岽郦和生魏新吴颖王洪英
Owner CHINA PETROLEUM & CHEM CORP
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