Cooling tower is exposed for a long time, the adsorption of the fan is very strong, so that a large number of sediment, dirt into the tower, a long time running will make the cooling tower slowly reduce the heat dissipation capacity, cloth water outlet hole is easy to block, sediment and dirt is also easy to enter the cooling water system to go, will directly affect the normal cooling of the cooling water system. In order to prevent the above situation, the cooling tower must be regularly cleaned.

Cooling tower cleaning treatment program process

Program one: stop cleaning

That is, in accordance with the cleaning process sterilization and algae cleaning - cleaning descaling agent cleaning - pre-film - cleaning after the cleaning. This program needs to be cleaned in the shutdown state for about 8 days, the descaling rate of 95% or more.

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

1、Water rinsing

The purpose of water flushing is to flush out the dust, sediment, algae and corrosion and other loose dirt in the system as much as possible with high flow of water, and check the leakage of the system at the same time. Flushing water flow rate is greater than 0.15m / s is appropriate, flushing qualified to drain the system flushing water.

2、Algaecide cleaning

The purpose of sterilization and algae cleaning is to kill the microorganisms in the system, and make the surface of the equipment attached to the biological slime peeled off. After draining the rinse water will be added to the system to clean the algaecide, when the turbidity of the system tends to balance stop cleaning.

3、Cleaning liquid descaling cleaning

The purpose of cleaning liquid cleaning is to use the cleaning agent to dissolve the scale and oxide in the system and then dissolve in water to rinse off. The cleaning agent will be added to the central air conditioning system with a circulation pump cycle cleaning and emptying at the highest point and the lowest point drainage, in order to avoid air resistance and guide shower blockage, affecting the cleaning effect. Cleaning should be timed to detect the concentration of cleaning fluid, metal ions (Fe2+, Fe3+, Cu2+) concentration, temperature, PH value, etc., when the metal ion concentration tends to level off when the end of cleaning.

4、Rinsing after cleaning

The water rinsing is to rinse off the residual cleaning solution when cleaning and cleaning off the impurities, rinsing is to constantly open up the guide shower to make the impurities deposited in the short tube, residual liquid rinsed off. Rinse is constantly testing the PH value, turbidity, when the PH value, turbidity tends to level off when the end of the rinse.

5、Pre-membrane

The purpose of the pre-film is to allow the cleaning of the metal surface in an activated state or the metal surface of the protective film is damaged to form a complete layer of corrosion-resistant protective film.

6、Cleaning after the end of the cleaning

Cooler evaporator cleaning, cleaning should be the end of the host of the cooler, evaporator open cooler with a special through-tube device to pull through the flush by tube, as the water circulation system of the cooler is exposed to the atmosphere and the heat exchange temperature is high, so the cooler scaling condition will be more serious than other places, if necessary, the cooler should be a separate external open circulation system for cleaning and descaling, to ensure that the heat exchanger piping in the cooler Smooth. Flush the evaporator with high-pressure water to thoroughly flush out the impurities precipitated in the evaporator, and if necessary, also clean the evaporator separately from the open circulation system.

Cooling tower cleanup, because the cooling tower is exposed to the atmosphere, there will be a large number of mud, algae, etc. attached to the surface of the cooling tower filler, do not clean up will be in the future operation of these dirt flushed to the cooler within the cooler caused by heat exchange pipeline blockage, affecting the heat exchange effect, so the cooling tower must be thoroughly cleaned.

Program two: no stop neutral cleaning

In the normal operation of the unit in the state of the neutral cleaning agent into the cooling water, chilled water system cycle cleaning for about 30 days to release the cleaning solution, plus maintenance agent cleaning process is over. This program cleaning time is longer, but can be carried out in the normal operation of the unit, and will not affect the normal operation of the unit.

Characteristics of neutral cleaning agent:

1, neutral cleaning without corrosion: the product does not change the PH value of water after adding to the central air conditioning water system, no corrosion damage to the metal, completely solving the corrosion potential of the strong acidic cleaning agents commonly used at present on the metal, to achieve a corrosion-free cleaning.

2, high cleaning efficiency: effective for all types of scale, especially for acid cleaning insoluble scale such as sulfate and algae biological slime can also be completely removed, scale removal rate of more than 95%, so as to restore the original performance of equipment, to maintain clean operation of equipment.

3、Simple operation: under the normal start-up condition of central air conditioning, the neutral cleaning agent will be added to the water system for about 30 days to completely remove all kinds of scale in the water system.

Neutral cleaning principle:

According to the latest theory of ligand field chemistry, the d orbit of metal ions in some ligand compounds under the influence of electrostatic field, can be split and form orbitals of different energies, when the ligand gives the lone pair of electrons and the central metal element to form O Jian, if the ligand molecules exist in the empty π molecular orbitals or empty p, d molecular orbitals, and the symmetry is appropriate, the lone pair of electricity on the d orbitals of the central element can be formed with the ligand The lone pair of electric energy in the d orbital of the central element can form a feedback π-bond with the ligand, thus forming a stable ligand compound.

Based on the above principles, compounds with π-accepting ligands are selected to cause energy level splitting of Ca2+ and Mg2+ d orbitals and have π molecular orbitals. 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 drainage.

Maintenance

After all the cleaning is finished, the cooling water and refrigerant water system will be maintained with chemicals. It can form stable complexes with iron, copper, zinc and other metal ions to stop the corrosion of oxygen and metal ions in water. Through chelation, inhibition and lattice distortion effect. It can prevent the formation of scale salts in water. Thus playing the role of corrosion and scale inhibition. Cooling water with algaecide, because the cooling water system is in the open state, there will be bacteria and algae in the process of recycling, algaecide can inhibit the survival of bacteria and algae to play a role in regulating water quality.