Cleaning And Maintenance of Heat Exchanger

After a long time operation of the heat exchanger , scale and rust problems will inevitably occur. Corrosion: The cooling and chilled water of the heat exchanger are highly corrosive without treatment, such as putting ordinary steel sheets or iron nails into the water. Rust will appear in a few days, the longer the time, the more serious the rust.

The inner wall of the equipment is often rusted off due to corrosion, or even perforated. The rusted off will block the coil and reduce the heat exchange effect; at the same time, the existence of corrosion greatly shortens the service life of the equipment. Scale formation: Inorganic salts dissolved in water in the pipeline crystallize out and form scale on the wall of the heat exchange surface such as the condenser, resulting in a reduction in heat exchange efficiency and a reduction in cooling effect. In severe cases, it decreases by 30%. At the same time, the amount of hard scale increases, the power consumption increases, and in severe cases it increases by 35%. Biological slime: due to the formation of dirt in the mud, sand and humus of the water, and the biological slime formed by bacteria, algae and other microorganisms and their secretions, the pipeline will be blocked in serious cases; and dirt and slime will affect the heat The exchange efficiency and excessive power consumption cause high-voltage operation, and in severe cases cause over-pressure shutdown.

All these have seriously affected the normal operation of the heat exchanger. Therefore, the problems of scale, rust, sludge, bacteria and algae in the heat exchanger system will directly lead to the weakening of the heat transfer capacity, shortened service life, reduced operating reliability, and increased energy consumption. In order to make the heat exchanger system operate in an optimized state, the cooling water and chilled water system of the heat exchanger must be treated with special chemical drugs: removing scale, rust, slime, sterilization and anti-corrosion treatment. The significance is: saving Energy, reduce operating costs. In the heat transfer process of the evaporator and condenser of the heat exchanger, the dirt directly affects the heat transfer efficiency and the normal operation of the equipment. The operation results of the heat exchanger show that the power consumption of the heat exchanger that has not been cleaned after a period of operation will be Increase 10-30% to extend service life and reduce equipment depreciation and usage fees. Reduce accidental downtime and improve the cooling effect. Cleaning can remove sludge, make the pipeline smooth, and the water quality is clear. At the same time, descaling and anti-scaling improve the thermal efficiency of the condenser and evaporator, thereby avoiding the phenomenon of overpressure shutdown during high-pressure operation, increasing the flow of chilled water, improving the cooling effect, and making the system operate safely and efficiently. Save a lot of maintenance costs for users: untreated heat exchangers will cause pipe blockage, scaling, corrosion, and overpressure shutdown until an accident occurs. If the heat exchanger is leaked due to corrosion or the solution is contaminated, the copper pipe needs to be replaced. Replacing the solution and repairing the main unit generally require a maintenance fee of 20,000-50,000 yuan. After treatment, it can not only reduce maintenance costs, but also extend the service life of equipment, and also reduce the loss of hundreds of thousands of millions for the owners.

In order to make the heat exchanger system operate in an optimized state, it is necessary to perform special chemical treatment on the water system of the heat exchanger system: remove scale, rust, slime, sterilization and anti-corrosion treatment:

1. Chemical cleaning and sterilization: adding chemical cleaning agent and sterilizing agent to clean and disperse rust, dirt, oil, bacteria and algae in the system, and restore it to a clean metal surface;

2. Daily maintenance: Add corrosion and scale inhibitors to avoid metal rust and prevent calcium and magnesium ion crystal precipitation.