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The cooling tower is exposed for a long time, the adsorption force of the fan is very strong, so that a large number of sediment and dirt enter the tower, long-term operation will make the cooling tower slowly reduce the heat dissipation capacity, the water distributor outlet hole is easy to plug, sediment and dirt are also easy to enter the cooling water system, will directly affect the normal cooling water system. In order to prevent the above situation, the cooling tower must be cleaned regularly.
Cooling tower cleaning treatment program flow
Scheme one: Stop the machine for cleaning
That is, according to the cleaning process, sterilization and algae cleaning - cleaning detergent cleaning - pre-film - cleaning after cleaning. This solution needs to be cleaned in the shutdown state for about 8 days, and the scale removal rate is more than 95%.
Cleaning procedure: water flushing - sterilization and algae cleaning - cleaning agent descaling cleaning - cleaning after washing - pre-film - cleaning after cleaning.
1, water rinse
The purpose of water flushing is to use a large flow of water as far as possible to wash off the dust, silt, shed algae and corrosion in the system loose dirt, while checking the leakage of the system. The flow rate of the flushing water should be greater than 0.15m/s, and the flushing water in the system should be exhausted after the flushing is qualified.
2, sterilization and algae cleaning
The purpose of sterilization and algal cleaning is to kill microorganisms in the system and make the biological mud attached to the surface of the equipment peel away. After the flushing water is drained, the system is cleaned by adding bactericide and algicide. When the turbidity of the system tends to balance, the cleaning is stopped.
3, cleaning liquid descaling cleaning
The purpose of cleaning liquid cleaning is to use cleaning agent to dissolve the scale and oxide in the system and then dissolve in water to wash away. The cleaning agent is added to the central air conditioning system with a circulating pump for circulating cleaning and emptying at the highest point and discharging at the lowest point to avoid air blockage and guiding shower blockage, affecting the cleaning effect. When cleaning, the cleaning solution concentration, metal ion (Fe2+, Fe3+, Cu2+) concentration, temperature, PH value, etc., should be regularly detected, and the cleaning should be ended when the metal ion concentration tends to be flat.
4. Rinse after cleaning
The water flushing is to wash away the residual cleaning liquid and the impurities removed during cleaning, flushing is to constantly open the shower to make the impurities deposited in the short pipe, the residual liquid washed away. Flushing is to constantly test PH value and turbidity, and to end the flushing when PH value and turbidity tend to flatten out.
5. Pre-film
The purpose of the pre-film is to form a complete corrosion-resistant protective film on the metal surface or the damaged metal surface after cleaning in an active state.
6. Clean up after cleaning
Cooler evaporator cleaning, after the end of cleaning should be the host cooler, evaporator open the cooler with a special tube by tube pull through the rinse, because the water circulation system of the cooler is exposed to the atmosphere and the heat exchange temperature is high, so the scale of the cooler will be more serious than other places, if necessary, the cooler should be a separate external open circulation system for cleaning and descaling. Make sure every copper pipe in the cooler is smooth. Flush the evaporator with high pressure water, thoroughly wash away the precipitated impurities in the evaporator, and clean the evaporator's separate external circulation system if necessary.
Cooling tower cleaning, because the cooling tower is exposed to the atmosphere, there will be a lot of sediment, algae and other attached to the cooling tower packing surface during the operation, do not clean up the dirt will be washed into the cooler in the future operation resulting in the blockage of the heat exchange copper pipe in the cooler, affecting the heat exchange effect, so the cooling tower must be thoroughly cleaned.
Scheme 2: Neutral cleaning without shutdown
Under the normal operation of the unit, the neutral cleaning agent is added to the cooling water, the chilled water system is cleaned for about 30 days, and the cleaning solution is released, and the cleaning process is completed with the maintenance agent. The cleaning time of this scheme is relatively long, but it can be carried out under the normal operation of the unit, and will not affect the normal operation of the unit.
Features of neutral cleaning agent:
1, neutral cleaning no corrosion: the product does not change the PH value of the water after adding to the central air conditioning water system, no corrosion damage to the metal, completely solve the corrosion hazard of the currently commonly used strong acid cleaning agent on the metal, to achieve non-corrosion cleaning.
2, high cleaning efficiency: It is effective for all types of scale, especially for the acid washing of sulfate and other insoluble scale and algae biological mud can also be completely removed, the scale removal rate is more than 95%, so as to restore the original performance of the equipment, keep the equipment clean operation.
3, the operation is simple: under the normal boot condition of the central air conditioning, the neutral cleaning agent is added to the water system to run for about 30 days, and the cleaning agent can be completely removed from the water system.
Neutral cleaning principle: According to the latest theory of ligand field chemistry, the d orbitals of metal ions can split under the influence of the electrostatic field of some ligand compounds to form orbits with different energies. When the ligand gives lone pair electrons to form O linkages with the central metal elements, if there are empty π molecular orbitals or empty p and d molecular orbitals in the ligand molecule, and the symmetry is suitable, The lone pair on the d orbital of the central element can form a feedback π bond with the ligand, thus forming a stable coordination compound.
Based on the above principles, compounds with π molecular orbitals that can split Ca2+ and Mg2+d are selected as π-accepting ligands. When this compound interacts with calcium and magnesium scale, it forms stable coordination compounds with Ca2+ and Mg2+d, thus destroying the molecular structure of calcium and magnesium scale, dissolving it in water and removing it by sewage
After the cleaning is complete, the cooling water and refrigerant water system shall be maintained by pharmaceutical agents. The addition of corrosion and scale inhibitor in the refrigerant water system can form stable complexes with iron, copper, zinc and other metal ions to prevent the corrosion of oxygen and metal ions in water. Through chelation, inhibition and lattice distortion. Can prevent the formation of scale salts in water. Thus it plays the role of corrosion inhibition and scale inhibition. Adding bactericidal algaecide into the cooling water, as the cooling water system is in an open state, there will be fungi and algae in the recycling process, and the bactericidal algaecide can inhibit the generation and survival of fungi and algae, thus playing a role in regulating water quality.
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Jiangsu Jincheng Air Conditioning Engineering Co., Ltd. is a comprehensive manufacturer of special air-conditioning equipment design, production, installation, and commissioning of clean room, electricity, tobacco, civil air defense engineering, medical clean room, clean room, electricity, tobacco, civil air defense engineering, medical clean room. Mainly produce JCZK combined air conditioning unit, cooling tower, glass steel ventilated galvanized sheet pipe, stainless steel pipe, polyurethane ventilation pipe and air conditioning accessories, Jincheng air conditioner is wide, the type, the unique model, superior performance, and user Favused.
