[Chimney anti-corrosion construction].
Chimney anti-corrosion construction is an important part of the chimney project, the purpose of which is to protect the chimney from corrosion, prolong the service life, and ensure the normal operation and safe production of the chimney. This paper will elaborate on the necessity of chimney anti-corrosion construction, common anti-corrosion methods, construction steps and quality control.
First, the necessity of chimney antiseptic.
During operation, the chimney will be eroded by a variety of factors, such as corrosive components in the flue gas, chemicals in the environment, microorganisms, etc. These factors will lead to the corrosion of the chimney wall, and even cause collapse accidents in serious cases, which poses a great threat to the production and personnel safety of the enterprise. Therefore, it is very necessary to carry out anti-corrosion construction on the chimney.
2. Common anti-corrosion methods.
1.Paint anti-corrosion.
Paint anti-corrosion is to paint the corrosion-resistant paint on the inner wall of the chimney to form a protective film to isolate the contact between the corrosive medium and the chimney wall, so as to achieve the purpose of anti-corrosion. Commonly used coatings are epoxy resin, polyurethane, chlorinated rubber, etc.
2.Glass flakes are antiseptic.
Glass flake antiseptic is to combine glass flakes with resin to form a hard protective layer. Glass flakes have excellent corrosion resistance and high mechanical strength, which can effectively improve the durability and wear resistance of chimneys.
3.Anti-corrosion of brick slabs.
Brick board anti-corrosion is to paste corrosion-resistant brick board on the inner wall of the chimney to form a protective layer. The brick board material has good high temperature resistance and corrosion resistance, but the construction is difficult, and it is suitable for high temperature, high pressure and high humidity environment.
4.Thermal spray anti-corrosion.
Thermal spraying anti-corrosion is to spray corrosion-resistant materials on the inner wall of the chimney at high temperatures to form a dense protective layer. Thermal spraying anti-corrosion has the advantages of fast construction speed and excellent corrosion resistance, but the cost is high.
Third, the construction steps.
1.Preparation.
Before construction, on-site investigation should be carried out to understand the structure and operation of the chimney, and a detailed construction plan and safety measures should be formulated. At the same time, it is necessary to prepare the required materials and equipment, and conduct technical disclosure and safety training for the construction personnel.
2.Basic processing.
Before construction, the inner wall of the chimney should be cleaned to remove debris, oil, etc., and the local corroded area should be repaired. At the same time, the appearance and structure of the chimney should be checked to ensure that it meets the design requirements.
3.Selection and coating of anticorrosive materials.
According to the actual situation and design requirements, select the appropriate anti-corrosion materials. Before painting, the inner wall of the chimney should be treated, such as dust removal, dehumidification, etc. When painting, the prescribed coating process and operating procedures should be followed to ensure that the coating quality meets the requirements.