Carbon steel corrosion inhibitor for circulating water treatment and application thereof

A technology of circulating water and corrosion inhibitor, applied in the direction of complex/solubilizer treatment, etc., can solve the problems of reduced exchange rate of heat exchangers, frequent maintenance, threats to normal production, etc., to prevent erosion and damage, and reduce environmental pollution. , the effect of good carbon steel anti-corrosion effect

Inactive 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

[0002] Corrosion, fouling and algae growth are the three major problems in the treatment of circulating cooling water. Corrosion and damage to the heat exchanger will greatly reduce the exchange rate, and frequent maintenance will threaten the normal production

Method used

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  • Carbon steel corrosion inhibitor for circulating water treatment and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-6

[0018] Preparation Examples 1-6 were prepared using the components in parts by mass as shown in Table 1.

[0019] Table 1 The mass fraction of each component in Preparation Examples 1-6

[0020] Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Preparation Example 5 Preparation Example 6 Borax 2.0 2.5 2.0 2.2 2.3 2.5 Sodium nitrite 1.5 2.0 1.5 1.7 2.0 2.0 Sodium Gluconate 1.0 1.2 1.1 1.0 1.2 1.2 Sodium acrylate 0.5 0.8 0.6 0.8 0.5 0.8 water 5.0 4.0 4.8 4.3 4.0 3.5

Embodiment 1

[0021] Example 1 Corrosion inhibition effect test

[0022] In the circulating water treatment of a 600MW thermal power plant unit, due to water quality and control and other reasons, before adding carbon steel corrosion inhibitor, the perennial corrosion rate of carbon steel pipes exceeded the standard, up to 0. 253mm / a, far exceeding the standard. The corrosion rate of carbon steel specified in GB / T 50050 should be less than the 0.075 mm / aden limit. Therefore, a test of adding a carbon steel corrosion inhibitor was carried out on this unit, and the carbon steel corrosion inhibitor was selected from Preparation Example 6.

[0023] The water volume of the circulating water system of the unit: 32800 m 3 , circulating water volume: 74266 m 3 / h, evaporation loss: 1155 m 3 / h, wind loss: 75 m 3 / h, blowdown loss: 447 m 3 / h, the concentration ratio of circulating water is controlled at 3.0.

[0024] According to the process requirements, the first dosing in the test was carr...

Embodiment 2

[0034] Example 2 Economic Effect Test

[0035] In order to test the effect of the agent, we carried out a test to increase the concentration ratio on two 600MW thermal power generating units. Before the experiment, the unit was operated under the condition of 2.5 times the concentration rate due to corrosion, and the corrosion rate at this time was 0.0736 mm / a. If the rate was increased, the corrosion would be aggravated and the production safety would be affected. After using the carbon steel corrosion inhibitor obtained in Preparation Example 6 of the present invention, the concentration ratio is maintained at about 3.0 as designed, and the carbon steel corrosion rate is basically maintained at about 0.06 mm / a, ensuring safe production.

[0036] At the same time, due to the improvement of the concentration ratio, the 2 units can save more than 3 million tons of fresh water resources for the society every year, save about 6 million yuan of costs caused by this (water fee is c...

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Abstract

The invention relates to carbon steel corrosion inhibitor for circulating water treatment. The carbon steel corrosion inhibitor comprises the following components in parts by mass: 2.0-2.5 parts of borax, 1.5-2.0 parts of sodium nitrite, 1.0-1.2 parts of sodium gluconate, 0.5-0.8 part of sodium acrylate, and 3.5-5.0 parts of water; and meanwhile, the invention relates to application of the carbon steel corrosion inhibitor for the circulating water treatment in a circulating cooling water system. The carbon steel corrosion inhibitor can largely reduce the carbon steel corrosion speed, increase the concentration ratio, decrease the equipment material damage and the water resource cost and improve the unit security and stability, is suitable for the circulating water system in such fields as electric power, chemical engineering, medicine and petroleum, and is used for preventing the corrosion of carbon steel.

Description

technical field [0001] The invention belongs to the field of corrosion inhibition treatment of carbon steel materials in industrial circulating cooling water systems, and particularly relates to a carbon steel corrosion inhibitor for circulating water treatment and applications thereof. Background technique [0002] Corrosion, scaling and bacteria and algae growth are the three major problems in circulating cooling water treatment. Corrosion and damage to the heat exchanger will greatly reduce the exchange rate, and frequent maintenance will threaten the normal production. Due to the cheapness and easy procurement of carbon steel materials, most of the circulating water pipelines in thermal power plants use Q235 or 20G carbon steel. The reuse of reclaimed water brings challenges to the anticorrosion of water pipelines, and the corrosion problem of carbon steel in the water pipelines transporting circulating water and supplementary water emerges year by year. Therefore, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/18C23F11/08C02F5/08
Inventor 王平侯文龙任汉涛周慧波龙潇
Owner STATE GRID CORP OF CHINA
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