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Recirculated cooling water system and purification method for recirculated cooling water

A technology of circulating cooling water and circulating water, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of long pretreatment process, difficult equipment maintenance, and shortened membrane life etc. to achieve the effects of low operating costs, energy saving, and less bacteria

Inactive Publication Date: 2010-12-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that these technical processes are relatively long, especially the water inlet requirements for membrane treatment are strict, the pretreatment process before entering the membrane is long, the cost is high, and the maintenance of equipment is difficult, and the pollution of leaking materials can easily shorten the life of the membrane. and lead to resin failure

Method used

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  • Recirculated cooling water system and purification method for recirculated cooling water

Examples

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Effect test

Embodiment 1

[0023] This example shows that the present invention can purify the circulating water to different degrees through the biological aerated filter with adjustable hydraulic retention time, and the sewage of the circulating water can be discharged directly.

[0024] The circulating water volume of the circulating cooling system of a petrochemical refinery in China is 8700m 3 / h, the existing side filter capacity is 300m 3 / h, for the purpose of saving water and reducing emissions, the recycled water was reused from sewage. When the biological aeration filter is not installed, the water quality data of the circulating water is CODcr 80mg / L, BOD 5 10mg / L, ammonia nitrogen 2mg / L, turbidity 30mg / L. At this time, because the indicators of circulating water cannot meet the discharge standard of CODcr<60mg / L, the circulating water must be treated in the sewage treatment plant before being discharged after reaching the standard, which greatly increases the load of the sewage treatment ...

Embodiment 2

[0027] This example shows that the present invention can carry out biochemical treatment on the leaked pollutants without extensive discharge and supplementation. Combining with Example 1, it is illustrated that the present invention can prevent and treat the deterioration of circulating water quality due to material leakage, circulating water for sewage reuse and other reasons.

[0028] The device situation is the same as in Example 1, and the residence time is 1.5h. One day, a material leak occurred in the circulating water system, and the leaking heat exchanger was found within 36 hours and plugged. The leaked material was light diesel oil. The water quality data of circulating water during normal production is CODcr 40mg / L, ammonia nitrogen 0.1mg / L, and turbidity 8mg / L. The water quality analysis data monitored since the leakage was found are shown in Table 1.

[0029] Table 1

[0030] time

[0031] As can be seen from Table 1, the biological aerated filter of...

Embodiment 3

[0033] This embodiment illustrates that the present invention can be used for purification of different circulating waters and has wide applicability.

[0034] The circulating water volume of the circulating cooling system of a petrochemical fertilizer plant in China is 12000m 3 / h, side filter processing capacity is 400m 3 / h, the original water quality data in normal production is: CODcr 80mg / L, BOD 5 15mg / L, ammonia nitrogen 15mg / L, turbidity 30mg / L. The biological aerated filter is installed near the sump in the form of a bypass, and the volume of the biological aerated filter is 800m 3 , with a velocity of 400m 3 / h, the hydraulic retention time is 2h. The water quality data of circulating water during normal production is CODcr 50mg / L, ammonia nitrogen 2mg / L, and turbidity 10mg / L. One day, a material leak occurred in the circulating water system, and the leaking heat exchanger was found within 12 hours and plugged. The leaked material was ammonia. The water quality...

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Abstract

The invention provides a recirculated cooling water system which comprises a collecting basin, a water pump, a heat exchanger and a cooling tower which are distributed along the flow direction of recirculated cooling water, as well as a biological aerated filter arranged behind a by-pass filter or a biological aerated filter arranged on a by-pass leaded out from the collecting basin. The recirculated cooling water system provided by the invention is adopted to purify the recirculated cooling water, thus the problem of quality deterioration of the recirculated cooling water caused by serious or slight material leakage, sewage recycling carried out on the recirculated cooling water and other reasons can be prevented and treated, and along with the extension of the operational time, the water quality can be gradually and thoroughly purified, and the direct sewage disposal of the recirculated water meets the requirement of the state environmental regulation that the CODcr is less than 60mg / L. The method of the invention has the advantages of low equipment investment and operational cost, small occupied area, no chemical agent consumption and higher practicability and economical efficiency.

Description

technical field [0001] The invention relates to a circulating cooling water system and a method for purifying circulating cooling water. Background technique [0002] During the long-term operation of the circulating water system, due to corrosion of the production equipment by the circulating cooling water and process materials or problems in the manufacturing quality of the equipment, it is very common for process materials to leak into the circulating water, resulting in the deterioration of the circulating water quality. In addition, after enterprises save water and reduce emissions and reuse sewage into circulating water, the harmful impurities such as turbidity, COD, ammonia nitrogen in circulating water will increase, and the water quality will be more harsh. The deterioration of the circulating water quality will easily cause the water stabilizer to fail, and a large amount of biological slime will grow, which will lead to a decrease in the heat transfer efficiency o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F3/10
CPCY02W10/10Y02W10/37
Inventor 傅晓萍李本高
Owner CHINA PETROLEUM & CHEM CORP
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