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By-pass flow treatment method for circulating water from power plant

A circulating water and flow treatment technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of untimely dosing, insufficient dosage, and non-sustainability and other problems, to achieve the effect of reducing the amount of sewage, increasing the concentration ratio, and saving water resources

Active Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the risk of fouling in the circulating water system, the concentration ratio of circulating water must be strictly controlled, and part of the circulating water shall be discharged as sewage; in order to reduce the impact of microbial growth in the circulating water, it is necessary to regularly sterilize the circulating water. The treatment is carried out by adding fungicides to circulating water, but the addition of fungicides is generally intermittent and not continuous, and there are problems such as untimely dosing, insufficient dosage, and too long dosing intervals, resulting in poor bactericidal effects, etc. question

Method used

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  • By-pass flow treatment method for circulating water from power plant
  • By-pass flow treatment method for circulating water from power plant

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Embodiment 1

[0017] (1) Draw circulating water from the circulating water tower of the power plant, and use 100m 3 The flow rate per hour is sent to the multi-media filter for filtration. The diameter of the multi-media filter is Φ3200, the layer height is 1200mm, of which the quartz sand is 800mm, anthracite is 400mm, and the output of a single multi-media filter is 50 m 3 / h. The turbidity of the effluent is less than 5NTU. The water quality of circulating water in the power plant is shown in Table 1.

[0018] Table 1 Circulating water quality

[0019]

[0020] (2) Send the effluent from the filter in step (1) to ultrafiltration for treatment. The membrane element of the ultrafiltration is an external pressure ultrafiltration membrane, the recovery rate is 90%, and the SDI of the ultrafiltration effluent is less than 4.0.

[0021] (3) Add hydrochloric acid to adjust the pH value of the ultrafiltration water obtained in step (2) to 6.0-6.5, and send it to nanofiltration for treatme...

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Abstract

The invention discloses a by-pass flow treatment method for circulating water from a power plant, which sequentially comprises the following steps: feeding circulating water into a multimedia filter, and filtering; then performing ultrafiltration treatment; feeding ultrafiltered effluent water into a nanofilter, and treating; feeding the obtained nanofilter produced water having zero hardness and serving as electrolyte into an electrolytic bath, and electrolyzing to prepare sodium hypochlorite, wherein the available chlorine content of the produced water after electrolysis is controlled to reach 100 mg / L or above by regulating the flow rate of the electrolyte and electrolysis voltage; and finally feeding back the obtained water solution containing sodium hypochlorite and having zero hardness to the circulating water. According to the method disclosed by the invention, based on the characteristics of the circulating water such as high water temperature, high salt content and the like, the circulating water is electrolyzed to prepare the sodium hypochlorite, both the high temperature and the high salt content are beneficial to increase the yield of the available chlorine generated by electrolysis, the circulating water enriched with the sodium hypochlorite is fed back to the circulating water system without the introduction of foreign impurities, the continuous sterilization treatment of the circulating water is realized, and the influence of microorganism growth on the circulating water system is effectively reduced.

Description

technical field [0001] The invention relates to a method for treating side flow of circulating water in a power plant. technical background [0002] The circulating water system of the power plant is the system with the largest water consumption in the power plant. Since the temperature of the circulating water is in the range of 10-40 ℃ all year round, and it is sunny and rich in nutrients, it is a favorable environment for the growth and reproduction of bacteria. The scaling, corrosion and Microbial growth is the main problem faced by circulating water systems for a long time. In order to reduce the risk of fouling in the circulating water system, the concentration ratio of circulating water must be strictly controlled, and part of the circulating water shall be discharged as sewage; in order to reduce the impact of microbial growth in the circulating water, it is necessary to regularly sterilize the circulating water. The treatment is carried out by adding fungicides to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 龙潇刘克成张建华
Owner STATE GRID CORP OF CHINA
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