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Method of biological inhibition using sea water cooling system

A cooling system, bio-suppression technology, applied in the direction of sterilization/microdynamic water/sewage treatment, etc., can solve the problems of safety, environmental protection and drug resistance that cannot be solved, reduce heat exchange efficiency, and increase heat energy needs, etc. Achieve the effect of solving the drug resistance of marine organisms, simple equipment maintenance, and simple dosing equipment

Active Publication Date: 2008-06-04
武汉中新同和科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The attachment of these marine organisms in the seawater cooling system seriously affects the safe operation and work efficiency of the unit; the main problems are as follows: 1. Reduce the heat exchange efficiency. The attachment of marine organisms directly reduces the heat transfer coefficient of the heat exchange system. Studies have shown that the thickness of each millimeter will reduce the conductivity by 5%; 2. Increase the unit cost, due to the decrease in heat transfer efficiency, the heat energy required for unit power generation will increase; 3. The mucus secreted by the attachment points of marine animals has a strong effect on metals. At the same time, it also increases the speed of chemical corrosion under the scale, which affects safe operation; 4. A large number of marine organisms may clog the pipeline system and affect safe operation.
[0007] The above two methods are to add chlorine or chlorine-containing products; a certain effect can be achieved when a large dose is added, but the problems of safety, environmental protection and drug resistance cannot be solved

Method used

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  • Method of biological inhibition using sea water cooling system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: For a 4×300MW unit in a thermal power plant in the south, the dosing point is at the entrance of the forebay of the circulating water pump.

[0035] 1) Put the non-oxidizing biocide into the seawater pool of the seawater cooling system (at the entrance of the forebay of the circulating water pump), add 10 mg of non-oxidizing biocide per liter of seawater, the dosing time is 45 minutes, and the frequency is 3 times a week times, every 55-56 hours into one.

[0036] 2) Add non-oxidizing biocide for two months and then add oxidizing biocide at a dose of 10 mg per liter of seawater, once a week, and the dosing time is about 2 hours.

[0037] 3) One month after the oxidizing biocide is put in, add a non-oxidizing biocide, and cycle step 1) and step 2).

[0038] The detection results of the total number of bacterial colonies in the water samples before and after using this method and the adhesion of marine organisms in the water chamber of the cooling system are s...

Embodiment 2

[0042] The system operation and dosing method are the same as in Example 1. The detection results of the total number of bacterial colonies in the water samples before and after adopting this method and the adhesion of marine organisms in the water chamber of the cooling system are shown in Table 1.

[0043]In the present embodiment, the non-oxidative biocide is composed of isothiazolinone, diethanolamide, fatty alcohol polyoxyethylene (5-6) ether, ethanol and water, and the weight percentages of each composition are: isothiazolone 50, Diethanolamide 10, fatty alcohol polyoxyethylene (5-6) ether 6, ethanol 10, water 24; mix, stir and filter to obtain the product.

[0044] In this embodiment, the oxidative biocide is mainly composed of peracetic acid, hydrogen peroxide and water, and the weight percentages of each composition are: 5 peracetic acid, 10 hydrogen peroxide, and 85 water; the product is obtained after mixing, stirring and filtering .

Embodiment 3

[0046] The system operation and dosing method are the same as in Example 1. The detection results of the total number of bacterial colonies in the water samples before and after adopting this method and the adhesion of marine organisms in the water chamber of the cooling system are shown in Table 1.

[0047] In the present embodiment, the non-oxidizing biocide is made up of dodecyltributylphosphonium chloride, fatty alcohol polyoxyethylene (5-6) ether, ethanol and water, and the percentage by weight of each composition is: dodecyl Tributylphosphonium chloride 50, fatty alcohol polyoxyethylene (5-6) ether 3, ethanol 10, water 37; mix, stir and filter to obtain the product.

[0048] In this example, the oxidizing biocide is mainly composed of bromochlorodimethylhydantoin and water, and the percentages by weight of each composition are: 15% bromochlorodimethylhydantoin and 85% water; the product is obtained after mixing, stirring and filtering.

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Abstract

The present invention relates to a method for making biological inhibition of sea water cooling system. It is characterized by that in the cooling system adopting sea water or fresh water of estuary as cooling water the non-oxidative biocide and oxidative biocide can be alternatively added. Besides, said invention also provides their concrete alternative addition mode.

Description

technical field [0001] The invention relates to a method for biological inhibition of a seawater cooling system. Background technique [0002] With the rapid development of society and the rapid expansion of population, the crisis of fresh water resources has become an urgent problem facing all countries in the world. Using seawater as cooling water in large-scale petrochemical and electric power industries can effectively save water resources; seawater cooling technology is widely used in thermal power, nuclear power, petrochemical, metallurgy, steel plants and other industries. However, the attachment of marine organisms is a problem that has plagued the production for a long time. [0003] The attachment of marine organisms mainly refers to the attachment of a large number of marine organisms on the pipes and heat exchange equipment of the cooling water system, including bacteria, algae and marine animals. Marine animals include sea oysters (barnacles. Barnacles), mussel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/50
Inventor 冯文芳魏红刚
Owner 武汉中新同和科技有限责任公司
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