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Method for coating potassium persulphate film on copper tube of condenser

A technology of potassium persulfate and condenser, which is applied in the coating process of metal materials, etc., which can solve the problems of long construction period, difficult guarantee of coating quality, and long coating time

Inactive Publication Date: 2013-07-17
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the coating is easy to operate during operation, the coating time is as long as 96 hours or more, and the quality of the coating is difficult to guarantee. Generally, power plants can only use it for repairing and protecting the copper tube of the condenser.
The one-time coating needs to install a large temporary system, which requires a large workload, long construction period and high cost. It is generally only used during the infrastructure construction period before the new unit is put into production, and it is difficult to do this for the unit after it is put into production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The present invention will be further illustrated below by specific examples.

[0015] Coating on inner surface of copper tube of condenser in thermal power plant:

[0016] (1) Pickling of copper tubes (methods already available in literature)

[0017] Remove the sundries in the condenser, fill the condenser with demineralized water, turn on the heater, start the cleaning pump, and carry out circulation heating to raise the temperature. When the solution temperature reaches 30°C, add pickling corrosion inhibitor, and after 20 minutes of circulation, the pump Add 30% industrial hydrochloric acid, wash in a cycle for 4-8 hours, drain the pickling liquid quickly, add liquid caustic soda during the discharge process, make the pH control at 6-9, add water to the cleaning tank, start the clean water pump to cycle wash, End flushing when PH ≥ 4.0;

[0018] (2) Alkaline cleaning of copper tubes (methods already available in literature)

[0019] After the water flushing is co...

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Abstract

The invention belongs to a metal surface coating method and concretely relates to a method for coating a film on the inner surface of a copper tube of a condenser in a thermal power plant. The method comprises the following steps: 1, injecting clear water to a cleaning box, and heating; 2, preparing a coating liquid comprising water, potassium persulphate, sodium hydroxide and triethanolamine, wherein the coating liquid: water: potassium persulphate: sodium hydroxide: triethanolamine ratio is 1000:8-12:2-3:1-2; and 3, coating: starting a dosing pump, continuously adding the coating liquid prepared in step 2 to the condenser, maintaining the temperature designed in step 1, carrying out continuous cycle for 6-8h, and finishing coating. The potassium persulphate film forming method can reach a one-time coating quality standard, shortens the film forming time to 6-8h from at least 96h, can be used in the one-time coating of the copper tube of the condenser in the large and small repairing processes of a set, and has popularization application values.

Description

technical field [0001] The invention belongs to a method for coating a metal surface, in particular to a method for coating the inner surface of a copper tube of a condenser in a thermal power plant. Background technique [0002] In many thermal power plants, large-area corrosion of condenser cooling copper pipes has occurred, which has affected the safe production of units. In order to solve this problem, in addition to supervising and controlling the circulating water quality, each power plant has adopted ferrous sulfate coating technology for the copper tubes of the condenser. Ferrous sulfate coating technology is divided into one-time coating and running coating. Although the coating is easy to operate during operation, the coating time is as long as 96 hours or more, and the quality of the coating is difficult to guarantee. Generally, power plants can only use it for repairing and protecting the copper tube of the condenser. The one-time coating needs to install a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/63
Inventor 不公告发明人
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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