Treating method of sea water as circulating cooling water

A technology of circulating cooling water and treatment methods, which is applied in the directions of sterilization/microdynamic water/sewage treatment, complexes/solubilizer treatment, etc. It can solve the problems of serious microbial reproduction, sticky mud adhesion, easy blockage, corrosion, etc., and achieve a solution Slime adheres to easily block equipment and solve the problem of serious microbial reproduction

Inactive Publication Date: 2005-07-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention solves the problem of seawater corrosion and fouling of materials such as navy brass and carbon steel pipes in the circulating cooling water system when seawater is used as the circulating cooling water, and at the same time solves the problem of serious microbial reproduction in seawater and sticky mud adhesion and easy blockage of equipment, etc. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] When the seawater of the present invention is used as a treatment method for circulating cooling water, the system operating parameters are shown in Table 1, and the seawater quality is shown in Table 2.

[0015] Operating parameters

unit

value

Circulating water volume Qr

t / h

15000

Water retention V

m 3

3500

Evaporated water Qe

t / h

200

Sewage volume Qb

t / h

250～500

Supplementary water quantity Qm

t / h

450～750

Concentration factor K

1.4～2.0

[0016] Analysis Project

unit

Supplementary sea water

Circulating seawater (K=2.0)

pH

8.11

8.5 (estimated value)

Conductivity

us / cm

7500

15000

suspended matter

mg / L

25.50

51.0

calcium ion

``

428.20

856.4

Magnesium ions

``

1321.80

2643.6

Total hardness 1 / 2 (Ca 2+ +Mg 2+ )

...

Embodiment 2

[0024] System operation parameter and sea water quality are the same as embodiment 1

[0025] Seawater is added with 45mg / L corrosion inhibitor, 35mg / L scale inhibitor, 25mg / L oxidizing biocide and 80mg / L non-oxidizing biocide when circulating as cooling water. The results are shown in Table 3.

[0026] Prepare corrosion inhibitors, scale inhibitors, oxidizing biocides and non-oxidizing biocides according to the following weight percentages,

[0027] Corrosion inhibitor: sodium molybdate 11%, sodium gluconate 14%, sodium benzoate 9%, zinc sulfate 19%, zinc chloride 9%, trisodium citrate 11%, sulfamic acid 5%, sodium hexametaphosphate 7% %, sodium sulfate 9%, benzotriazole 6%.

[0028] Scale inhibitor: N-phosphonic acid group N-sulfonic acid group N'-dicarboxy-ethylenediamine 7%, 2-phosphonobutane, 1,2,4-tricarboxylic acid 19%, phosphoric acid 6%, Acrylic acid / 2-acrylamido-2-methylpropanesulfonic acid / 2-hydroxy-2-phosphonoacetic acid / phosphonic acid tetrapolymer 24%, water 44...

Embodiment 3

[0032] System operation parameter and sea water quality are the same as embodiment 1

[0033] Seawater is added with corrosion inhibitor 50mg / L, scale inhibitor 40mg / L, oxidizing biocide 25mg / L, and non-oxidizing biocide 100mg / L when circulating as cooling water. The results are shown in Table 3.

[0034] Prepare corrosion inhibitors, scale inhibitors, oxidizing biocides and non-oxidizing biocides according to the following weight percentages,

[0035] Corrosion inhibitor: sodium molybdate 13%, sodium gluconate 15%, sodium benzoate 8%, zinc sulfate 18%, zinc chloride 8%, trisodium citrate 12%, sulfamic acid 4%, sodium hexametaphosphate 6 %, sodium sulfate 8%, benzotriazole 8%.

[0036] Scale inhibitor: N-phosphonic acid group N-sulfonic acid group N'-dicarboxy-ethylenediamine 8%, 2-phosphonobutane, 1,2,4-tricarboxylic acid 18%, phosphoric acid 7%, Acrylic acid / 2-acrylamido-2-methylpropanesulfonic acid / 2-hydroxy-2-phosphonoacetic acid / phosphonic acid tetrapolymer 30%, water 3...

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Abstract

The treatment of sea water as circulating cooling water solves the problem of corrosion and scaling of cooling water system of admiralty brass, carbon steel and other material and the problem of jamming caused by microbes and clay in sea water. The treatment method is to add corrosion inhibitor 40-50 mg, antiscaling agent 30-40 mg, oxidizing biocide 20-30 mg and non-oxidizing biocide 80-120 mg to each liter of sea water used as circulating cooling water. The treatment method coincides with relevant specification and reaches very high water saving effect.

Description

technical field [0001] The invention relates to a treatment method for circulating cooling water, more specifically to a treatment method for using seawater as circulating cooling water. Background technique [0002] China is a country with a lot of water resources, but due to the uneven temporal and spatial distribution of freshwater resources, uneven population distribution and unbalanced social and economic development, freshwater resources in some areas are seriously in short supply, especially in my country's coastal economically developed areas, although they play an important role in my country's national economy. However, most of the per capita water resources in coastal industrial cities in developed coastal areas are less than 500m 3 (Per capita water resources in Dalian, Tianjin, Qingdao, Lianyungang, and Shanghai are all lower than 200m 3 ), in a state of extreme water scarcity. According to statistics, about 70% to 80% of urban water is industrial water, and ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/50C02F5/08
Inventor 杨文忠唐永明王锦堂刘瑛尹晓爽殷鹏伟
Owner NANJING UNIV OF TECH
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