Discussion on the concentration ratio of circulating cooling water
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I have read a lot of materials on the design of circulating cooling water treatment systems. Generally, in China, a concentration ratio of around 5 is considered optimal, but General Electric believes that a ratio of over 20 is also feasible. I would like to ask how we should determine the appropriate concentration ratio
The concentration ratio is an important indicator for determining the utilization rate of cooling water circulation. The higher this value, the more times the circulating water is reused, which allows for a reduction in the amount of water that needs to be added and in the volume of wastewater discharged, thus helping to conserve water resources. However, excessively increasing the concentration ratio leads to the following problems: (1) an increase in the salt content, resulting in excessive saturation of scaling ions, which exacerbates corrosion and scaling in cold exchange equipment. (2) Increased growth of fungi and algae; (3) Higher requirements are placed on the chemicals used, with changes in the precision required for their addition as well as in the tolerance of harmful substances to these chemicals. Therefore, increasing the concentration ratio is a trend, but it needs to be addressed in light of the actual conditions of the enterprise.
In current designs, it seems that n=4 is often chosen...