How to clean the central air conditioning cooling tower

How to clean the central air conditioning cooling tower

The cooling tower is exposed to the outside for many years, and the fan’s adsorption power is very strong, so that a large amount of sand and dirt will enter the tower. Long-term operation will slowly reduce the cooling capacity of the cooling tower, and the water outlet of the water distributor can easily be blocked. Sand and dirt can easily enter the cooling water system, which will directly affect the normal cooling of the cooling water system. In order to prevent this from happening, the cooling tower must be cleaned regularly.

　　 1. Cooling tower cleaning treatment plan process:

　　 Plan 1: Shutdown cleaning:

　　 is to follow the cleaning process to sterilize and kill algae cleaning-cleaning with descaling agent cleaning-pre-film-cleaning after cleaning. This solution requires cleaning for about eight days in the shutdown state, and the descaling rate is above 95%.

　　Cleaning procedure: water rinse-sterilization and algae cleaning-cleaning agent descaling cleaning-rinse after cleaning-pre-film-cleaning after cleaning.

　　 (1), water rinse:

The purpose of 　　 water flushing is to use large-flow water to flush out loose dirt, such as dust, sand, shed algae and corrosives, in the system as much as possible, and to check the leakage of the system. The flow rate of the flushing water should be greater than 0.15m/s. After the flushing is qualified, the flushing water in the system will be drained.

　　 (two), sterilization and algae cleaning:

The purpose of sterilization and algae cleaning is to kill the microorganisms in the system and peel off the biological slime attached to the surface of the equipment. After draining the flushing water, add a bactericidal and algaecide to the system for cleaning, and stop cleaning when the turbidity of the system reaches equilibrium.

　　 (three), cleaning liquid descaling cleaning:

　　The purpose of cleaning fluid is to use the cleaning agent to dissolve the scale and oxide in the system and then dissolve it in water to rinse off. Add the cleaning agent to the central air-conditioning system and use the circulating pump to circulate the cleaning and drain at the highest point and the lowest point to avoid air resistance and guide shower blockage, which will affect the cleaning effect. During cleaning, the cleaning solution concentration, metal ion (Fe2+, Fe3+, Cu2+) concentration, temperature, PH value, etc. should be checked regularly, and the cleaning should be finished when the metal ion concentration becomes flat.

　　 (four), rinse after cleaning:

　　 This water flushing is to wash away the remaining cleaning liquid and impurities during cleaning. The flushing is to keep the guide shower off to flush away the impurities and residual liquid deposited in the short pipe. Flushing is to continuously test the PH value and turbidity, and finish the flushing when the PH value and turbidity tend to be flat.

　　 (5), pre-filming:

　　The purpose of pre-filming is to form a complete corrosion-resistant protective film on the metal surface in the activated state after cleaning or the metal surface where the protective film is damaged.

　　 (6). Cleaning up after cleaning:

　　 1. Clean the cooler evaporator:

After cleaning, the cooler and evaporator of the host should be opened and the cooler should be pulled through and flushed with a special pipe pipe. Since the water circulation system of the cooler is exposed to the atmosphere and the heat exchange temperature is high, the fouling condition of the cooler will be more Other places are serious. If necessary, the cooler should be cleaned and descaled separately with an open circulation system to ensure that every copper pipe in the cooler is unblocked. Rinse the evaporator with high-pressure water to thoroughly rinse the impurities deposited in the evaporator. If necessary, clean the evaporator with a separate external circulation system.

　　2, cooling tower cleaning:

Since the cooling tower is exposed to the atmosphere, a large amount of sand, algae, etc. will adhere to the surface of the cooling tower filler during operation. If it is not cleaned up, these dirt will be washed into the cooler in the future operation, resulting in heat exchange copper in the cooler The blockage of the pipe affects the heat exchange effect, so the cooling tower must be thoroughly cleaned.

　　 Plan 2: Non-stop neutral cleaning:

　　 In the normal operation of the unit, add neutral detergent to the cooling water and refrigerated water system to circulate cleaning for about 30 days to release the cleaning fluid, and the cleaning process with the maintenance agent is over. The cleaning time of this scheme is relatively long, but it can be carried out under the normal operation of the unit, and it will not affect the normal operation of the unit.

　　 (1), the characteristics of neutral cleaning agent:

　　 1. Neutral cleaning without corrosion:

　　 The product does not change the pH value of the water after being added to the central air-conditioning water system, and has no corrosion damage to the metal. It completely solves the hidden danger of metal corrosion of the currently commonly used strong acid cleaning agent and realizes non-corrosive cleaning.

　　 2. High cleaning efficiency:

It is effective for all types of scales, especially for hardly soluble scales such as acid-washed sulfate and algae biological sludge. The scale removal rate is over 95%, so as to restore the original performance of the equipment and keep the equipment running clean. .

　　3, simple operation:

　　 Under the normal power-on condition of the central air conditioner, adding a neutral detergent to the water system and running for about 30 days to drain the detergent can completely remove various scales in the water system.

　　 (two), the principle of neutral cleaning:

According to the latest theory of coordination field chemistry, the d orbitals of metal ions can be split to form orbitals with different energies under the influence of the electrostatic field of certain ligand compounds. When the ligand gives a lone pair of electrons and the central metal element forms O When in good time, if there are empty π molecular orbitals or empty p and d molecular orbitals in the ligand molecule, and the symmetry is appropriate, the lone pair on the d orbital of the central element can form a feedback π bond with the ligand. Thereby forming a stable coordination compound.

　　 Based on the above principle, a compound that can split the energy level of Ca2+ and Mg2+d orbitals and has a π molecular orbital is selected as the π accepting ligand. When this compound interacts with calcium and magnesium scales, it forms stable coordination compounds with Ca2+ and Mg2+d, thereby destroying the molecular structure of calcium and magnesium scales, dissolving them in water and removing them through sewage.

　　 2. Maintenance:

　　After all cleaning is completed, the cooling water and refrigerant water system shall be maintained with chemicals. Corrosion and scale inhibitors are added to the refrigerant water system to form stable complexes with iron, copper, zinc and other metal ions to prevent the corrosion of oxygen and metal ions in the water. Through chelation, inhibition and lattice distortion. It can prevent the formation of scale by the scale-forming salts in the water, thereby playing the role of corrosion and scale inhibition. Adding a bactericidal algicide to the cooling water, because the cooling water system is in an open state, fungi and algae will be produced during the recycling process. The bactericidal algicide can inhibit the production and survival of the bacteria and algae, thereby regulating the water quality.