New idea and medium test proof of water quality control of circulating cooling water

In industrial production and commercial activities, the circulating cooling water system is the key facility to ensure the smooth production, but the traditional additive water quality control technology faces many challenges, such as corrosion, scaling, algae breeding and waste of water resources. In view of these problems, an innovative water quality control idea is proposed: to selectively remove harmful ions (such as Ca ², Mg², Cl), while retaining the beneficial oxygen-containing anions (such as alkalinity, silicates, sulfate, etc., etc.). Based on this idea, a set of production test equipment is designed to achieve the corrosion suppression characteristics of oxygen anion and save water quality by improving the concentration multiple of water saving.

Based on this idea, a set of production test equipment with a processing capacity of 2 m³ / h was developed, and the medium test was proved in the central air conditioning circulating cooling water system for several months. The results show that the concentration ratio of the circulating cooling water system under the new idea (the highest value is 30 according to the conductivity) far exceeds the traditional dosing method, and the water quality is significantly improved. The concentration of Ca ², Mg² and Cl is only 1 / 6 to 1 / 11 of dosing, and the turbidity is only 1 / 10 of dosing. The risk of corrosion and scaling is stable and controllable. In addition, due to the very low concentration of N and P elements in the circulating cooling water, the breeding phenomenon of bacteria and algae has been effectively suppressed.

The  highest value of "calcium hardness and total alkalinity" in circulating cooling water respectively 1.6 times and 5 times of the dosage method and specification limits, SiO2 concentration is significantly higher than the dosage method level (the highest value is 3 times the dosage method), from the circulating cooling water turbidity and corrosion rate, the enrichment of oxygen anion did not cause the risk of scaling, and played a significant role in corrosion inhibition. 

Compared with the current mainstream dosage method, the selective removal of harmful ions and the retention of beneficial ions greatly improve the concentration ratio of the circulating cooling water system, significantly improve the water quality, huge water saving potential, and obvious corrosion suppression effect. This study provides pilot-scale data for the research and development of a new technology for the water quality control of industrial circulating cooling water with a huge amount of water, and provides strong support for the efficient, green and water-saving operation of the circulating cooling water system.