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Composite prefilming technique of steam condenser copper tube

A condenser and pre-film technology, applied in the direction of metal material coating process, can solve problems such as poor protection, and achieve the effect of solving limitations, increasing alkali resistance, and expanding adaptability

Active Publication Date: 2013-09-11
SCI GREEN SHANDONG ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the existing condenser copper tube pre-filming process is poorly protected in an alkaline environment, the present invention proposes a condenser copper tube composite pre-filming process

Method used

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  • Composite prefilming technique of steam condenser copper tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 After the condenser copper tube composite pre-film system is connected, first wash, degrease, pickle and activate the condenser copper tube, and then perform pre-film treatment. The specific steps are as follows:

[0029] 1. Cleaning

[0030] 1. Rinse

[0031] Fill the cleaning pre-membrane system with clean water and turn on the pump to circulate, check whether there is any leakage in the system, eliminate the leakage in time, and continue to circulate and rinse until the effluent is clear and then discharge.

[0032] 2. Degreasing and degreasing cleaning

[0033] Inject clean water and oil stain cleaning agent into the cleaning pre-membrane system, turn on the pump to circulate, add clean water when the system water is insufficient, and pass steam into the liquid distribution tank, heat to above 50°C, and discharge the cleaning liquid after 8 hours of circular cleaning ; Then use clean water to flush the system with the pump for 30 minutes, and dra...

Embodiment 2

[0048] Except following difference, other is with embodiment 1.

[0049] 3. Pre-film

[0050] 1. Preparation of pre-film solution and pre-film treatment

[0051] Inject appropriate amount of clean water (tap water or underground water, soft water is not available, soft water buffer capacity is poor, and pH is difficult to control) into the cleaning pre-membrane system, and the pre-membrane agent ferrous sulfate is 300 ~ 400mg / L and the pH regulator Na 2 CO 3 Put 500~700mg / L into the dosing tank and stir evenly; turn on the pump to circulate, and use Na 2 CO 3 Adjust the pH value of the solution and control it to between 5.5 and 6. After the circulation is uniform and stable, pre-film treatment; during the process of circulating pre-film, raise the height of the circulating return pipe so that it is 1.5 to 2 meters away from the page of the circulation tank, and every 30 minutes Monitor Fe once 2+ Ion concentration, when Fe 2+ When the ion concentration is lower than 300...

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Abstract

The invention belongs to the technical field of protection of steam condenser copper tubes in power plants, and particularly relates to a composite prefilming technique of a steam condenser copper tube, which comprises the following steps: (1) preparing a prefilming liquor: the prefilming liquor comprises ferrous sulfate, 2-sulfhydrylbenthothiazole, a pH regulator and water, wherein the content of the ferrous sulfate in the prefilming liquor is 300-400mg / L, the content of the 2-sulfhydrylbenthothiazole is 500-700mg / L, the pH regulator is added until the pH value of the prefilming liquor is 7-9, preferably 8, and a proper amount of water is added; (2) carrying out prefilming treatment on steam condenser copper tube surface by using the prefilming liquor prepared in the step (1); and (3) introducing forced-air blast into the steam condenser copper tube subjected to the prefilming treatment in the step (2). The invention greatly enhances the adaptability of the protective film to the acid / alkali environment, and solves the problem of limitation of the protective film to environmental adaptability.

Description

technical field [0001] The invention belongs to the technical field of protecting copper tubes of condensers in power plants, and in particular relates to a composite pre-filming process for copper tubes of condensers. Background technique [0002] The condensers of most thermal power plants in my country use circulating cooling water to cool the condensers. Due to the water quality characteristics of circulating cooling water, there is widespread corrosion of the copper tubes of the condensers, which makes the condensers The service life is reduced and the harm is extremely great. Therefore, various scientific research units and power plants are actively trying to find ways to protect the copper tubes of the condenser. They have successively used cathodic protection, protective casing at the end of the tube, and ferrous sulfate film forming method. , copper reagent film-making method, etc., but these measures either only protect the water chambers, tube sheets and tube ends a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/68C23C22/63
Inventor 田民格李爱兵
Owner SCI GREEN SHANDONG ENVIRONMENT TECH CO LTD