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Because the scaling, corrosion and algae reproduction of air conditioning cooling water system are not formed in a short period of time, and will not have a destructive impact on the system in a short period of time, so the attention of operation managers is usually not satisfied. Other. Because the air conditioning cooling water system is relatively simple, the planners pay less attention to it. Moreover, the disposal of cooling water is related to both water supply and drainage and HVAC specialty, and the cooling water system is mostly carried out by HVAC specialists. Therefore, it is unreasonable to form a congenital plan for glass tank membrane cleaning water equipment. In the planning process, the cooling water system of air conditioning is easy to scale and corrode, and the characteristics of bacteria and algae multiplication are different from that of chilled water system. The disposal methods of cooling water can be divided into chemical method and physical method.

(1) Chemical method. At present, chemical methods are often used in large-scale cooling water systems. For this reason, scale inhibitors, corrosion inhibitors, bactericidal and algae-killing agents and their associated cleaning agents must be added to the cooling water, and then a complete set of water disposal skills of cooling water are formed. It can be used as a reference for planning the disposal of cooling water of water-using equipment type air-conditioning in large electronics industry. The principle of chemical disposal method is shown in Fig. 1. Because scale inhibition can ensure heat transfer effect (energy saving), grade corrosion inhibitor and bactericide and algae killer can reduce equipment corrosion and extend equipment life are positive benefits, it has been paid attention to by the world. Foreign major water disposal companies take this skill as the top priority. It is reported that industrial water disposal in 1987. The sales value of the agent (some of the cooling water) is 586 million US dollars, and the sales value of the desalination equipment in 1992 is 765 million US dollars, with an annual growth rate of 6 Written. In recent years, with the rapid development of China's national economy, the research and development of water disposal agents have also made considerable progress.

(2) Drug-adding disposal method: This method was earlier used in hot water boiler and ship mooring water disposal. In recent years, this method has also been used in cooling water system. Most of the commonly used agents are solid crystal silicate film corrosion inhibitors. Practice has proved that the following points need to be noted: different film coating agent needs different dissolution temperatures, on the dosing irrigation in the circulating water system, water temperature can usually reach the dissolution temperature, and on the dosing irrigation in the water supply system, special attention should be paid to avoid too low water temperature, if the water temperature is too low, the film. If the corrosion inhibitor is not dissolved well, the effect of corrosion inhibition will be affected.

(3) Physical method: It has been widely used in recent years. It is a relatively ambitious water treatment method with low operating cost, convenient operation, easy control and pollution-free. In fact, as early as the 1960s, foreign countries shifted their attention from chemical method to physical development. At present, the physical methods used are magnetic method, electrolysis method, ultrasonic method, electrostatic method and so on.

Electrolysis can inhibit the adhesion of scale, but the scale removal is incomplete, and it has the risk of electrolytic pitting corrosion; the stability of magnetic method used earlier is poor, and the scale can not be controlled for a long time, so the iron oxide accumulated in the controller must be cleaned regularly; and the electrostatic law overcomes the shortcomings of the above-mentioned methods, besides scale prevention. Besides scale-dissolving, it has obvious effect of sterilization and algae-killing. However, electrostatic method and electronic water treatment method have a slightly lower corrosion inhibition effect than special chemical method, so other corrosion inhibition methods can not be considered in general air conditioning cooling water system. In some systems with high demand for corrosion inhibition, the best way to increase some corrosion inhibitors is to obtain better results.

5 Pipeline placement of cooling water system

Although the pipeline placement of cooling water system is relatively simple, if not carefully considered, some problems will arise. Because the circulating cooling water system is an open system, if the volume of the cooling tower catchment plate is small or the distance between the cooling tower and the pump is too far, and the resistance balance of the cooling tower outlet pipe in parallel operation is severely imbalanced, air will be mixed into the water, into the pump and pressed into the pipeline, resulting in severe water hammer causing damage to the pump outlet pipe and its fittings.

Author: Hangzhou Water Shield Technology Co., Ltd.

Website: http://www.zjhzsd.com/

Key words: glass tank membrane cleaning water equipment, electronic industry water equipment, desalination equipment