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How To Clean A Heat Exchanger?
Jan 15, 2018

Among the pressure vessel heat exchanger equipment,after prolonged operation, heat exchanger can not be prevented from showing scale, corrosion problems, corrosion:

Heat exchanger's cooling and chilled water without treatment is extremely corrosive. Rust can occur in a few days if plain steel or nails are put in water. The longer the placement, the more serious corrosion. Rust residue caused by corrosion often fall off the inner wall, or even perforated. The falling rust will block the coil to decrease the heat transfer effect. At the same time the existence of corrosion greatly reduced the service life of equipment.


About scaling: Inorganic salts dissolved in water in the pipe crystallize out, forming scale on the condenser and other heat exchanger tube wall. As a result, the heat exchange efficiency is reduced and the cooling effect is reduced. Seriously the heat exchange efficiency is decreased by 30% at the same time the hard scale is increased. 

Then the electricity consumption is increased. The most serious time biological slime is increased by 35%: As the water of soil, sediment, humus formation of dirt, together with bacteria, algae and other microorganisms and their secretions form biological slime, cause serious pipeline congestion. 

The dirt, sticky mud will affect the heat exchange efficiency and consume more energy, resulting in high-pressure operation and seriously causing over-pressure shutdown. 

All of these seriously affect the normal operation of the heat exchanger. Therefore, the heat exchanger system's scale, rust, sludge, bacteria and algae problems will lead directly to heat capacity weakened, shortened service life, reduce operational reliability, increase energy consumption and increase operating costs. 

In order for the heat exchanger system to operate in an optimized state, it is necessary to perform special chemical treatment on the heat exchanger cooling water and chilled water system: Clear scale, rust, sticky mud, sterilization and anti-corrosion treatment. The significance of doing this is saving energy and reducing operating costs. During the heat exchanger evaporator and condenser heat transfer process, the dirt directly affects the heat transfer efficiency and the normal operation of equipment. 

Heat exchanger operation results show that uncleaned heat exchanger operation after a period of time consumption will increase by 10-30% to extend the service life and reduce equipment depreciation royalties.


In order to reduce downtime and improve the cooling effect, clean the removable sludge, so that the pipeline is smooth, water quality is clear. 

At the same time descale and anti-scale to improve the condenserand evaporator thermal efficiency. Thus prevent the phenomenon of high pressure overpressure shutdown, improve the flow of chilled water, improve the cooling effect and make the system safe and efficient operation. 

To save users a lot of maintenance costs: Unprocessed heat exchangers will appeared clog, scale, corrode, shut down overpressure until an accident occurs. If the heat exchanger leaks due to corrosion, solution contamination, you need to replace the brass and solution and maintain the host. The general maintenance costs 2-5 million. After disposal, it can reduce maintenance costs, also extend the service life of equipment. 

For the owners, it can reduce hundreds of thousands of millions of losses. In order for the heat exchanger system to operate in an optimized state, it is necessary to perform a special chemical treatment on the water system of the heat exchanger system: Clear scale, rust, sticky mud, sterilization and anti-corrosion treatment: Chemical cleaning and sterilization: Add chemical cleaning agents and fungicides, wash and disperse the rust, scale, oil, bacteria and algae in the system to restore to a clean metal look; Routine maintenance: Add corrosion and scale inhibitor to prevent metal rusting and calcium magnesium ion crystallization precipitation.