Corrosion and scale inhibition method for soft water closed circulation system

A circulating system, soft water sealing technology, applied in the field of water treatment, can solve the problems of poor anti-corrosion ability, high cost of use, environmental pollution, etc., and achieve the effect of improved corrosion inhibition performance and low cost

Inactive Publication Date: 2013-06-05
LIUZHOU SHENGPENGYUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a corrosion and scale inhibition method for a soft water closed circulation system. This corrosion and scale

Method used

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  • Corrosion and scale inhibition method for soft water closed circulation system
  • Corrosion and scale inhibition method for soft water closed circulation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The water quality conditions of the treated soft water closed circulation system are: the hardness (calculated as calcium carbonate) is 5mg / L, the pH value of the soft water is adjusted to 9.0 with sodium carbonate, and then 10mg / L of methyl oxime is added to remove dissolved oxygen, and then hydroxyethyl Forked bisphosphonic acid 5mg / L, add benzotriazole 3mg / L. During implementation, the benzotriazole can be dissolved in desalinated water first.

Embodiment 2

[0025] The water quality conditions of the treated soft water closed circulation system are the same as in Example 1; the pH value of the soft water is adjusted to 8.8 with sodium carbonate, and 5 mg / L of carbohydrazide is added to remove dissolved oxygen, and then 2-phosphate-1,2,4- Tricarboxylic acid butane 3mg / L, add phosphonocarboxylic acid copolymer 5mg / L, add benzotriazole 10mg / L. During implementation, the benzotriazole can be dissolved in desalinated water first.

Embodiment 3

[0027] The water quality conditions of the treated soft water closed circulation system are the same as in Example 1; the pH value of the soft water is adjusted to 8.5 with sodium carbonate, and 30 mg / L of diethylhydroxylamine is added to remove dissolved oxygen, then sodium polyacrylate 1 mg / L is added, and sodium borate is added 4mg / L. During implementation, sodium borate can be dissolved with desalinated water earlier.

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Abstract

The invention discloses a corrosion and scale inhibition method for a soft water closed circulation system, and relates to the technical field of water treatment. The method comprises the following steps: A, regulating the pH value of a soft water closed circulation system to 8.5-10; B, adding deoxidizer into the soft water closed circulation system of which the pH value is regulated in the step A, wherein the addition concentration of the deoxidizer is 5-30 mg/L; and C, adding scale inhibitor and corrosion inhibitor into the soft water closed circulation system subjected to deoxidation treatment in the step B, wherein the addition concentration of the scale inhibitor is 1-100 mg/L, and the addition concentration of the corrosion inhibitor is 1-20 mg/L. According to the invention, soft water is deoxidized, and a tiny amount of scale inhibition component is added on the basis of deoxidation according to the mass of the soft water; the method is non-toxic and environment-friendly, and discharged water can not cause pollution to the environment even if the system leaks; the method is applicable to a high-temperature soft water system such as a blast furnace soft water system and the like; the method is low in cost; and the corrosion inhibition property is obviously enhanced to ensure that the method is superior to a molybdenum-phosphorus system formula commonly used at present.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a water treatment technology of a soft water closed circulation system. Background technique [0002] In order to save energy and water resources, the closed soft water circulation cooling method is used for cooling special parts of equipment such as ironmaking blast furnaces and steelmaking converters in the metallurgical industry. [0003] With the addition of supplementary water, a large amount of dissolved oxygen is brought into the soft water closed water system. When the water temperature is high, the depolarization of dissolved oxygen in the water is more active, and there is a difference in oxygen concentration where the oxygen content is close to saturation. Where the concentration of dissolved oxygen is high is the cathode of the battery, and a reduction reaction occurs; while an oxygen-deficient area occurs an oxidation reaction, the corrosion is accelerated, a...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 龙顺红吴文斌莫明姣黄静卢山潘智斌张庆忠范忠辉李开权
Owner LIUZHOU SHENGPENGYUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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