Ozone in Cooling Towers
There are three main factors to be controlled during extensive cooling tower water treatment
-Corrosion pipeline and heat exchanger element
-Scaling in the pipeline and (primarily) in heat exchangers
-Microbial expansion (bacteria, algae)
For instance, lower pH ethics prevent scaling as they boost metal corrosion. Through ozone treatment technique, all these characteristic can be controlled cooperatively, focused mainly on chemical biocides, corrosion inhibitors and scale inhibitors.
The appearance of scale is a outcome of calcium and magnesium situates on the units of cooling system. This outline is a block off layer for the heat ex changers and negatively manipulate heat transfer. Inevitably water evaporates thus, the saturation rate increases in the water and precipitates. This process is called ‘thickening’. This controls the amount of times the cooling water recycles.
The small amount of absorption of ozone treatment diminish in scale formation and controls the number of times the water recycles. Even water with a high content of dissolved solids can now be recycled and prevent further microbial growth.
Top researches have revealed that corrosion reduces more than 50% as soon as ozone is applied. There are two ways to avoid corrosion is ozone appliance.
Corrosion can be fixed when the degradation of a substance is due to the response of the atmosphere and erosion imply the deterioration of substantial material goods. The corrosion impedes the foremost method is mainly determined substance for a concrete creation of the water cooling system. Once the cooling water system installation works, this facilitates in achieved has pH balance and succeed to liquefy solid concentration. When these actions do not offer the desired result, corrosion-inhibitors would be added to the cooling water.
Second accepted method applied to destroy Corrosion: Is when, Corrosion is generally caused by microorganisms with the help of Ozone, it confines microbial increase by its shock treatment and corrosion- a forestalling film on the materials penetrating on its own oxides, stainless steel, and aluminum is based on an oxidative film. Modest ozone is requisite to form a corrosion-preventing film on metals. The high amount of zone can crumble some metals when put into practice, about 0,1 g/m3 of ozone is dosed to retort water. The toxin is destroyed only when the ozone retort with the organic substance and decompose to oxygen.
Ozone is powerful as it is a stronger disinfectant than any other chemical, it even deactivates Legionella bacteria. One cannot prevent microbial growth in a water system. Water and air of what we use always restrain bacteria and all through this processes, bacteria can enter the water. Also, even when repeated we cannot thicken the water organically with the usual water treatment preparation. This means that for each 1000 liters of suppletion water, at least 200 liters is carried off (20%).
Through ozone treatment the water can be thickened more than five times and can save upto 1000 liters of water and it is thickened almost 20 times. IE: For each 1000 liters of water, not more than 50 liters of water is carried off to the sewer. Only evaporation and splatter losses are filled up with fresh water in this case.
Applications and measures
Ozone appliance for cooling water system has won countless hearts because of its water superiority control in cooling the water.
The importance of this treatment:
Anti-scaling and anti-corrosion agents
– Acid dosages
– Water use
– Storage and transport costs of chemical biocides
– Pump capacity (more efficient heat transfer; lower energy use; higher yield heat exchanger)
Ozone application can only be done adequately when certain factors are taken into account:
– Water quality;
-Controls high COD or water for cooling towers that is hard.
– The time that ozone remains in the system. The half-life of ozone is usually less than 10 minutes in a cooling tower. To gain a significant residual concentration of ozone, the primary ozone concentration must be sufficient.
– Cooling water temperature. Ozone solubility and the half-life of ozone decrease at higher cooling water temperatures. This limits cooling water temperature for adequate application of ozonation. The limit is usually a cooling water temperature of 45 oC.
– Material choice. The material that a cooling tower consists of must be ozone-resistant.